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uipc_domain.c revision 1.66 
      1 /*	$NetBSD: uipc_domain.c,v 1.66 2007/07/09 21:10:57 ad Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1986, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)uipc_domain.c	8.3 (Berkeley) 2/14/95
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: uipc_domain.c,v 1.66 2007/07/09 21:10:57 ad Exp $");
     36 
     37 #include <sys/param.h>
     38 #include <sys/socket.h>
     39 #include <sys/socketvar.h>
     40 #include <sys/protosw.h>
     41 #include <sys/domain.h>
     42 #include <sys/mbuf.h>
     43 #include <sys/time.h>
     44 #include <sys/kernel.h>
     45 #include <sys/systm.h>
     46 #include <sys/callout.h>
     47 #include <sys/queue.h>
     48 #include <sys/proc.h>
     49 #include <sys/sysctl.h>
     50 #include <sys/un.h>
     51 #include <sys/unpcb.h>
     52 #include <sys/file.h>
     53 #include <sys/kauth.h>
     54 
     55 void	pffasttimo(void *);
     56 void	pfslowtimo(void *);
     57 
     58 struct domainhead domains = STAILQ_HEAD_INITIALIZER(domains);
     59 static struct domain *domain_array[AF_MAX];
     60 
     61 callout_t pffasttimo_ch, pfslowtimo_ch;
     62 
     63 /*
     64  * Current time values for fast and slow timeouts.  We can use u_int
     65  * relatively safely.  The fast timer will roll over in 27 years and
     66  * the slow timer in 68 years.
     67  */
     68 u_int	pfslowtimo_now;
     69 u_int	pffasttimo_now;
     70 
     71 void
     72 domaininit(void)
     73 {
     74 	__link_set_decl(domains, struct domain);
     75 	struct domain * const * dpp;
     76 	struct domain *rt_domain = NULL;
     77 
     78 	/*
     79 	 * Add all of the domains.  Make sure the PF_ROUTE
     80 	 * domain is added last.
     81 	 */
     82 	__link_set_foreach(dpp, domains) {
     83 		if ((*dpp)->dom_family == PF_ROUTE)
     84 			rt_domain = *dpp;
     85 		else
     86 			domain_attach(*dpp);
     87 	}
     88 	if (rt_domain)
     89 		domain_attach(rt_domain);
     90 
     91 	callout_init(&pffasttimo_ch, 0);
     92 	callout_init(&pfslowtimo_ch, 0);
     93 
     94 	callout_reset(&pffasttimo_ch, 1, pffasttimo, NULL);
     95 	callout_reset(&pfslowtimo_ch, 1, pfslowtimo, NULL);
     96 }
     97 
     98 void
     99 domain_attach(struct domain *dp)
    100 {
    101 	const struct protosw *pr;
    102 
    103 	STAILQ_INSERT_TAIL(&domains, dp, dom_link);
    104 	if (dp->dom_family < __arraycount(domain_array))
    105 		domain_array[dp->dom_family] = dp;
    106 
    107 	if (dp->dom_init)
    108 		(*dp->dom_init)();
    109 
    110 #ifdef MBUFTRACE
    111 	if (dp->dom_mowner.mo_name[0] == '\0') {
    112 		strncpy(dp->dom_mowner.mo_name, dp->dom_name,
    113 		    sizeof(dp->dom_mowner.mo_name));
    114 		MOWNER_ATTACH(&dp->dom_mowner);
    115 	}
    116 #endif
    117 	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
    118 		if (pr->pr_init)
    119 			(*pr->pr_init)();
    120 	}
    121 
    122 	if (max_linkhdr < 16)		/* XXX */
    123 		max_linkhdr = 16;
    124 	max_hdr = max_linkhdr + max_protohdr;
    125 	max_datalen = MHLEN - max_hdr;
    126 }
    127 
    128 struct domain *
    129 pffinddomain(int family)
    130 {
    131 	struct domain *dp;
    132 
    133 	if (family < __arraycount(domain_array) && domain_array[family] != NULL)
    134 		return domain_array[family];
    135 
    136 	DOMAIN_FOREACH(dp)
    137 		if (dp->dom_family == family)
    138 			return (dp);
    139 	return (NULL);
    140 }
    141 
    142 const struct protosw *
    143 pffindtype(int family, int type)
    144 {
    145 	struct domain *dp;
    146 	const struct protosw *pr;
    147 
    148 	dp = pffinddomain(family);
    149 	if (dp == NULL)
    150 		return (NULL);
    151 
    152 	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
    153 		if (pr->pr_type && pr->pr_type == type)
    154 			return (pr);
    155 
    156 	return (NULL);
    157 }
    158 
    159 const struct protosw *
    160 pffindproto(int family, int protocol, int type)
    161 {
    162 	struct domain *dp;
    163 	const struct protosw *pr;
    164 	const struct protosw *maybe = NULL;
    165 
    166 	if (family == 0)
    167 		return (NULL);
    168 
    169 	dp = pffinddomain(family);
    170 	if (dp == NULL)
    171 		return (NULL);
    172 
    173 	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
    174 		if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
    175 			return (pr);
    176 
    177 		if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
    178 		    pr->pr_protocol == 0 && maybe == NULL)
    179 			maybe = pr;
    180 	}
    181 	return (maybe);
    182 }
    183 
    184 struct sockaddr *
    185 sockaddr_alloc(sa_family_t af, int flags)
    186 {
    187 	const struct domain *dom;
    188 	struct sockaddr *sa;
    189 
    190 	if ((dom = pffinddomain(af)) == NULL)
    191 		return NULL;
    192 
    193 	if ((sa = pool_get(dom->dom_sa_pool, flags)) == NULL)
    194 		return NULL;
    195 
    196 	sa->sa_family = af;
    197 	sa->sa_len = dom->dom_sa_len;
    198 	return sa;
    199 }
    200 
    201 struct sockaddr *
    202 sockaddr_copy(struct sockaddr *dst, const struct sockaddr *src)
    203 {
    204 	KASSERT(dst->sa_family == src->sa_family);
    205 	memcpy(dst, src, src->sa_len);
    206 	return dst;
    207 }
    208 
    209 int
    210 sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
    211 {
    212 	int len, rc;
    213 	struct domain *dom;
    214 
    215 	if (sa1->sa_family != sa2->sa_family)
    216 		return sa1->sa_family - sa2->sa_family;
    217 
    218 	dom = pffinddomain(sa1->sa_family);
    219 
    220 	if (dom != NULL && dom->dom_sockaddr_cmp != NULL)
    221 		return (*dom->dom_sockaddr_cmp)(sa1, sa2);
    222 
    223 	len = MIN(sa1->sa_len, sa2->sa_len);
    224 
    225 	if (dom == NULL || dom->dom_sa_cmplen == 0) {
    226 		if ((rc = memcmp(sa1, sa2, len)) != 0)
    227 			return rc;
    228 		return sa1->sa_len - sa2->sa_len;
    229 	}
    230 
    231 	if ((rc = memcmp((const char *)sa1 + dom->dom_sa_cmpofs,
    232 		         (const char *)sa2 + dom->dom_sa_cmpofs,
    233 			 MIN(dom->dom_sa_cmplen,
    234 			     len - MIN(len, dom->dom_sa_cmpofs)))) != 0)
    235 		return rc;
    236 
    237 	return MIN(dom->dom_sa_cmplen + dom->dom_sa_cmpofs, sa1->sa_len) -
    238 	       MIN(dom->dom_sa_cmplen + dom->dom_sa_cmpofs, sa2->sa_len);
    239 }
    240 
    241 struct sockaddr *
    242 sockaddr_dup(const struct sockaddr *src, int flags)
    243 {
    244 	struct sockaddr *dst;
    245 
    246 	if ((dst = sockaddr_alloc(src->sa_family, flags)) == NULL)
    247 		return NULL;
    248 
    249 	KASSERT(dst->sa_len >= src->sa_len);
    250 
    251 	return sockaddr_copy(dst, src);
    252 }
    253 
    254 void
    255 sockaddr_free(struct sockaddr *sa)
    256 {
    257 	const struct domain *dom;
    258 
    259 	if ((dom = pffinddomain(sa->sa_family)) == NULL)
    260 		panic("%s: no such domain %d\n", __func__, sa->sa_family);
    261 
    262 	pool_put(dom->dom_sa_pool, sa);
    263 }
    264 
    265 /*
    266  * sysctl helper to stuff PF_LOCAL pcbs into sysctl structures
    267  */
    268 static void
    269 sysctl_dounpcb(struct kinfo_pcb *pcb, const struct socket *so)
    270 {
    271 	struct unpcb *unp = sotounpcb(so);
    272 	struct sockaddr_un *un = unp->unp_addr;
    273 
    274 	memset(pcb, 0, sizeof(*pcb));
    275 
    276 	pcb->ki_family = so->so_proto->pr_domain->dom_family;
    277 	pcb->ki_type = so->so_proto->pr_type;
    278 	pcb->ki_protocol = so->so_proto->pr_protocol;
    279 	pcb->ki_pflags = unp->unp_flags;
    280 
    281 	pcb->ki_pcbaddr = PTRTOUINT64(unp);
    282 	/* pcb->ki_ppcbaddr = unp has no ppcb... */
    283 	pcb->ki_sockaddr = PTRTOUINT64(so);
    284 
    285 	pcb->ki_sostate = so->so_state;
    286 	/* pcb->ki_prstate = unp has no state... */
    287 
    288 	pcb->ki_rcvq = so->so_rcv.sb_cc;
    289 	pcb->ki_sndq = so->so_snd.sb_cc;
    290 
    291 	un = (struct sockaddr_un *)&pcb->ki_src;
    292 	/*
    293 	 * local domain sockets may bind without having a local
    294 	 * endpoint.  bleah!
    295 	 */
    296 	if (unp->unp_addr != NULL) {
    297 		un->sun_len = unp->unp_addr->sun_len;
    298 		un->sun_family = unp->unp_addr->sun_family;
    299 		strlcpy(un->sun_path, unp->unp_addr->sun_path,
    300 		    sizeof(pcb->ki_s));
    301 	}
    302 	else {
    303 		un->sun_len = offsetof(struct sockaddr_un, sun_path);
    304 		un->sun_family = pcb->ki_family;
    305 	}
    306 	if (unp->unp_conn != NULL) {
    307 		un = (struct sockaddr_un *)&pcb->ki_dst;
    308 		if (unp->unp_conn->unp_addr != NULL) {
    309 			un->sun_len = unp->unp_conn->unp_addr->sun_len;
    310 			un->sun_family = unp->unp_conn->unp_addr->sun_family;
    311 			un->sun_family = unp->unp_conn->unp_addr->sun_family;
    312 			strlcpy(un->sun_path, unp->unp_conn->unp_addr->sun_path,
    313 				sizeof(pcb->ki_d));
    314 		}
    315 		else {
    316 			un->sun_len = offsetof(struct sockaddr_un, sun_path);
    317 			un->sun_family = pcb->ki_family;
    318 		}
    319 	}
    320 
    321 	pcb->ki_inode = unp->unp_ino;
    322 	pcb->ki_vnode = PTRTOUINT64(unp->unp_vnode);
    323 	pcb->ki_conn = PTRTOUINT64(unp->unp_conn);
    324 	pcb->ki_refs = PTRTOUINT64(unp->unp_refs);
    325 	pcb->ki_nextref = PTRTOUINT64(unp->unp_nextref);
    326 }
    327 
    328 static int
    329 sysctl_unpcblist(SYSCTLFN_ARGS)
    330 {
    331 	struct file *fp;
    332 	struct socket *so;
    333 	struct kinfo_pcb pcb;
    334 	char *dp;
    335 	u_int op, arg;
    336 	size_t len, needed, elem_size, out_size;
    337 	int error, elem_count, pf, type, pf2;
    338 
    339 	if (namelen == 1 && name[0] == CTL_QUERY)
    340 		return (sysctl_query(SYSCTLFN_CALL(rnode)));
    341 
    342 	if (namelen != 4)
    343 		return (EINVAL);
    344 
    345 	if (oldp != NULL) {
    346 		len = *oldlenp;
    347 		elem_size = name[2];
    348 		elem_count = name[3];
    349 		if (elem_size != sizeof(pcb))
    350 			return EINVAL;
    351 	} else {
    352 		len = 0;
    353 		elem_size = sizeof(pcb);
    354 		elem_count = INT_MAX;
    355 	}
    356 	error = 0;
    357 	dp = oldp;
    358 	op = name[0];
    359 	arg = name[1];
    360 	out_size = elem_size;
    361 	needed = 0;
    362 
    363 	if (name - oname != 4)
    364 		return (EINVAL);
    365 
    366 	pf = oname[1];
    367 	type = oname[2];
    368 	pf2 = (oldp == NULL) ? 0 : pf;
    369 
    370 	/*
    371 	 * there's no "list" of local domain sockets, so we have
    372 	 * to walk the file list looking for them.  :-/
    373 	 */
    374 	LIST_FOREACH(fp, &filehead, f_list) {
    375 		if (kauth_authorize_generic(l->l_cred,
    376 		    KAUTH_GENERIC_CANSEE, fp->f_cred) != 0)
    377 			continue;
    378 		if (fp->f_type != DTYPE_SOCKET)
    379 			continue;
    380 		so = (struct socket *)fp->f_data;
    381 		if (so->so_type != type)
    382 			continue;
    383 		if (so->so_proto->pr_domain->dom_family != pf)
    384 			continue;
    385 		if (len >= elem_size && elem_count > 0) {
    386 			sysctl_dounpcb(&pcb, so);
    387 			error = copyout(&pcb, dp, out_size);
    388 			if (error)
    389 				break;
    390 			dp += elem_size;
    391 			len -= elem_size;
    392 		}
    393 		if (elem_count > 0) {
    394 			needed += elem_size;
    395 			if (elem_count != INT_MAX)
    396 				elem_count--;
    397 		}
    398 	}
    399 
    400 	*oldlenp = needed;
    401 	if (oldp == NULL)
    402 		*oldlenp += PCB_SLOP * sizeof(struct kinfo_pcb);
    403 
    404 	return (error);
    405 }
    406 
    407 SYSCTL_SETUP(sysctl_net_setup, "sysctl net subtree setup")
    408 {
    409 	sysctl_createv(clog, 0, NULL, NULL,
    410 		       CTLFLAG_PERMANENT,
    411 		       CTLTYPE_NODE, "net", NULL,
    412 		       NULL, 0, NULL, 0,
    413 		       CTL_NET, CTL_EOL);
    414 	sysctl_createv(clog, 0, NULL, NULL,
    415 		       CTLFLAG_PERMANENT,
    416 		       CTLTYPE_NODE, "local",
    417 		       SYSCTL_DESCR("PF_LOCAL related settings"),
    418 		       NULL, 0, NULL, 0,
    419 		       CTL_NET, PF_LOCAL, CTL_EOL);
    420 	sysctl_createv(clog, 0, NULL, NULL,
    421 		       CTLFLAG_PERMANENT,
    422 		       CTLTYPE_NODE, "stream",
    423 		       SYSCTL_DESCR("SOCK_STREAM settings"),
    424 		       NULL, 0, NULL, 0,
    425 		       CTL_NET, PF_LOCAL, SOCK_STREAM, CTL_EOL);
    426 	sysctl_createv(clog, 0, NULL, NULL,
    427 		       CTLFLAG_PERMANENT,
    428 		       CTLTYPE_NODE, "dgram",
    429 		       SYSCTL_DESCR("SOCK_DGRAM settings"),
    430 		       NULL, 0, NULL, 0,
    431 		       CTL_NET, PF_LOCAL, SOCK_DGRAM, CTL_EOL);
    432 
    433 	sysctl_createv(clog, 0, NULL, NULL,
    434 		       CTLFLAG_PERMANENT,
    435 		       CTLTYPE_STRUCT, "pcblist",
    436 		       SYSCTL_DESCR("SOCK_STREAM protocol control block list"),
    437 		       sysctl_unpcblist, 0, NULL, 0,
    438 		       CTL_NET, PF_LOCAL, SOCK_STREAM, CTL_CREATE, CTL_EOL);
    439 	sysctl_createv(clog, 0, NULL, NULL,
    440 		       CTLFLAG_PERMANENT,
    441 		       CTLTYPE_STRUCT, "pcblist",
    442 		       SYSCTL_DESCR("SOCK_DGRAM protocol control block list"),
    443 		       sysctl_unpcblist, 0, NULL, 0,
    444 		       CTL_NET, PF_LOCAL, SOCK_DGRAM, CTL_CREATE, CTL_EOL);
    445 }
    446 
    447 void
    448 pfctlinput(int cmd, const struct sockaddr *sa)
    449 {
    450 	struct domain *dp;
    451 	const struct protosw *pr;
    452 
    453 	DOMAIN_FOREACH(dp) {
    454 		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
    455 			if (pr->pr_ctlinput != NULL)
    456 				(*pr->pr_ctlinput)(cmd, sa, NULL);
    457 		}
    458 	}
    459 }
    460 
    461 void
    462 pfctlinput2(int cmd, const struct sockaddr *sa, void *ctlparam)
    463 {
    464 	struct domain *dp;
    465 	const struct protosw *pr;
    466 
    467 	if (sa == NULL)
    468 		return;
    469 
    470 	DOMAIN_FOREACH(dp) {
    471 		/*
    472 		 * the check must be made by xx_ctlinput() anyways, to
    473 		 * make sure we use data item pointed to by ctlparam in
    474 		 * correct way.  the following check is made just for safety.
    475 		 */
    476 		if (dp->dom_family != sa->sa_family)
    477 			continue;
    478 
    479 		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
    480 			if (pr->pr_ctlinput != NULL)
    481 				(*pr->pr_ctlinput)(cmd, sa, ctlparam);
    482 		}
    483 	}
    484 }
    485 
    486 void
    487 pfslowtimo(void *arg)
    488 {
    489 	struct domain *dp;
    490 	const struct protosw *pr;
    491 
    492 	pfslowtimo_now++;
    493 
    494 	DOMAIN_FOREACH(dp) {
    495 		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
    496 			if (pr->pr_slowtimo)
    497 				(*pr->pr_slowtimo)();
    498 	}
    499 	callout_reset(&pfslowtimo_ch, hz / 2, pfslowtimo, NULL);
    500 }
    501 
    502 void
    503 pffasttimo(void *arg)
    504 {
    505 	struct domain *dp;
    506 	const struct protosw *pr;
    507 
    508 	pffasttimo_now++;
    509 
    510 	DOMAIN_FOREACH(dp) {
    511 		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
    512 			if (pr->pr_fasttimo)
    513 				(*pr->pr_fasttimo)();
    514 	}
    515 	callout_reset(&pffasttimo_ch, hz / 5, pffasttimo, NULL);
    516 }
    517