Home | History | Annotate | Line # | Download | only in kern
sysv_ipc.c revision 1.25.6.1
      1  1.25.6.1     skrll /*	$NetBSD: sysv_ipc.c,v 1.25.6.1 2015/06/06 14:40:22 skrll Exp $	*/
      2       1.7       cgd 
      3      1.13   mycroft /*-
      4      1.20        ad  * Copyright (c) 1998, 2007 The NetBSD Foundation, Inc.
      5      1.13   mycroft  * All rights reserved.
      6      1.13   mycroft  *
      7      1.13   mycroft  * This code is derived from software contributed to The NetBSD Foundation
      8      1.13   mycroft  * by Charles M. Hannum.
      9       1.1       cgd  *
     10       1.1       cgd  * Redistribution and use in source and binary forms, with or without
     11       1.1       cgd  * modification, are permitted provided that the following conditions
     12       1.1       cgd  * are met:
     13       1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     14       1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     15       1.6   hpeyerl  * 2. Redistributions in binary form must reproduce the above copyright
     16       1.6   hpeyerl  *    notice, this list of conditions and the following disclaimer in the
     17       1.6   hpeyerl  *    documentation and/or other materials provided with the distribution.
     18       1.1       cgd  *
     19      1.13   mycroft  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20      1.13   mycroft  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21      1.13   mycroft  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22      1.13   mycroft  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23      1.13   mycroft  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24      1.13   mycroft  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25      1.13   mycroft  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26      1.13   mycroft  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27      1.13   mycroft  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28      1.13   mycroft  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29      1.13   mycroft  * POSSIBILITY OF SUCH DAMAGE.
     30       1.1       cgd  */
     31      1.15     lukem 
     32      1.15     lukem #include <sys/cdefs.h>
     33  1.25.6.1     skrll __KERNEL_RCSID(0, "$NetBSD: sysv_ipc.c,v 1.25.6.1 2015/06/06 14:40:22 skrll Exp $");
     34      1.18  christos 
     35  1.25.6.1     skrll #ifdef _KERNEL_OPT
     36      1.18  christos #include "opt_sysv.h"
     37  1.25.6.1     skrll #endif
     38  1.25.6.1     skrll 
     39  1.25.6.1     skrll #include <sys/syscall.h>
     40  1.25.6.1     skrll #include <sys/syscallargs.h>
     41  1.25.6.1     skrll #include <sys/syscallvar.h>
     42       1.2   mycroft #include <sys/param.h>
     43       1.2   mycroft #include <sys/kernel.h>
     44       1.2   mycroft #include <sys/proc.h>
     45       1.2   mycroft #include <sys/ipc.h>
     46      1.18  christos #ifdef SYSVMSG
     47      1.18  christos #include <sys/msg.h>
     48      1.18  christos #endif
     49      1.18  christos #ifdef SYSVSEM
     50      1.18  christos #include <sys/sem.h>
     51      1.18  christos #endif
     52      1.18  christos #ifdef SYSVSHM
     53      1.18  christos #include <sys/shm.h>
     54      1.18  christos #endif
     55       1.4   hpeyerl #include <sys/systm.h>
     56      1.23     rmind #include <sys/kmem.h>
     57  1.25.6.1     skrll #include <sys/module.h>
     58      1.10   mycroft #include <sys/mount.h>
     59      1.10   mycroft #include <sys/vnode.h>
     60      1.12   mycroft #include <sys/stat.h>
     61      1.18  christos #include <sys/sysctl.h>
     62      1.17      elad #include <sys/kauth.h>
     63       1.1       cgd 
     64  1.25.6.1     skrll static int (*kern_sysvipc50_sysctl_p)(SYSCTLFN_ARGS);
     65  1.25.6.1     skrll 
     66  1.25.6.1     skrll /*
     67  1.25.6.1     skrll  * Values in support of System V compatible shared memory.	XXX
     68  1.25.6.1     skrll  * (originally located in sys/conf/param.c)
     69  1.25.6.1     skrll  */
     70  1.25.6.1     skrll #ifdef SYSVSHM
     71  1.25.6.1     skrll #if !defined(SHMMAX) && defined(SHMMAXPGS)
     72  1.25.6.1     skrll #define	SHMMAX	SHMMAXPGS	/* shminit() performs a `*= PAGE_SIZE' */
     73  1.25.6.1     skrll #elif !defined(SHMMAX)
     74  1.25.6.1     skrll #define SHMMAX 0
     75  1.25.6.1     skrll #endif
     76  1.25.6.1     skrll #ifndef	SHMMIN
     77  1.25.6.1     skrll #define	SHMMIN	1
     78  1.25.6.1     skrll #endif
     79  1.25.6.1     skrll #ifndef	SHMMNI
     80  1.25.6.1     skrll #define	SHMMNI	128		/* <64k, see IPCID_TO_IX in ipc.h */
     81  1.25.6.1     skrll #endif
     82  1.25.6.1     skrll #ifndef	SHMSEG
     83  1.25.6.1     skrll #define	SHMSEG	128
     84  1.25.6.1     skrll #endif
     85  1.25.6.1     skrll 
     86  1.25.6.1     skrll struct	shminfo shminfo = {
     87  1.25.6.1     skrll 	SHMMAX,
     88  1.25.6.1     skrll 	SHMMIN,
     89  1.25.6.1     skrll 	SHMMNI,
     90  1.25.6.1     skrll 	SHMSEG,
     91  1.25.6.1     skrll 	0
     92  1.25.6.1     skrll };
     93  1.25.6.1     skrll #endif
     94  1.25.6.1     skrll 
     95  1.25.6.1     skrll /*
     96  1.25.6.1     skrll  * Values in support of System V compatible semaphores.
     97  1.25.6.1     skrll  */
     98  1.25.6.1     skrll #ifdef SYSVSEM
     99  1.25.6.1     skrll struct	seminfo seminfo = {
    100  1.25.6.1     skrll 	SEMMAP,		/* # of entries in semaphore map */
    101  1.25.6.1     skrll 	SEMMNI,		/* # of semaphore identifiers */
    102  1.25.6.1     skrll 	SEMMNS,		/* # of semaphores in system */
    103  1.25.6.1     skrll 	SEMMNU,		/* # of undo structures in system */
    104  1.25.6.1     skrll 	SEMMSL,		/* max # of semaphores per id */
    105  1.25.6.1     skrll 	SEMOPM,		/* max # of operations per semop call */
    106  1.25.6.1     skrll 	SEMUME,		/* max # of undo entries per process */
    107  1.25.6.1     skrll 	SEMUSZ,		/* size in bytes of undo structure */
    108  1.25.6.1     skrll 	SEMVMX,		/* semaphore maximum value */
    109  1.25.6.1     skrll 	SEMAEM		/* adjust on exit max value */
    110  1.25.6.1     skrll };
    111  1.25.6.1     skrll #endif
    112  1.25.6.1     skrll 
    113  1.25.6.1     skrll /*
    114  1.25.6.1     skrll  * Values in support of System V compatible messages.
    115  1.25.6.1     skrll  */
    116  1.25.6.1     skrll #ifdef SYSVMSG
    117  1.25.6.1     skrll struct	msginfo msginfo = {
    118  1.25.6.1     skrll 	MSGMAX,		/* max chars in a message */
    119  1.25.6.1     skrll 	MSGMNI,		/* # of message queue identifiers */
    120  1.25.6.1     skrll 	MSGMNB,		/* max chars in a queue */
    121  1.25.6.1     skrll 	MSGTQL,		/* max messages in system */
    122  1.25.6.1     skrll 	MSGSSZ,		/* size of a message segment */
    123  1.25.6.1     skrll 			/* (must be small power of 2 greater than 4) */
    124  1.25.6.1     skrll 	MSGSEG		/* number of message segments */
    125  1.25.6.1     skrll };
    126  1.25.6.1     skrll #endif
    127  1.25.6.1     skrll 
    128  1.25.6.1     skrll MODULE(MODULE_CLASS_EXEC, sysv_ipc, NULL);
    129  1.25.6.1     skrll 
    130  1.25.6.1     skrll #ifdef _MODULE
    131  1.25.6.1     skrll SYSCTL_SETUP_PROTO(sysctl_ipc_setup);
    132  1.25.6.1     skrll SYSCTL_SETUP_PROTO(sysctl_ipc_shm_setup);
    133  1.25.6.1     skrll SYSCTL_SETUP_PROTO(sysctl_ipc_sem_setup);
    134  1.25.6.1     skrll SYSCTL_SETUP_PROTO(sysctl_ipc_msg_setup);
    135  1.25.6.1     skrll 
    136  1.25.6.1     skrll static struct sysctllog *sysctl_sysvipc_clog = NULL;
    137  1.25.6.1     skrll #endif
    138  1.25.6.1     skrll 
    139  1.25.6.1     skrll static const struct syscall_package sysvipc_syscalls[] = {
    140  1.25.6.1     skrll 	{ SYS___shmctl50, 0, (sy_call_t *)sys___shmctl50 },
    141  1.25.6.1     skrll 	{ SYS_shmat, 0, (sy_call_t *)sys_shmat },
    142  1.25.6.1     skrll 	{ SYS_shmdt, 0, (sy_call_t *)sys_shmdt },
    143  1.25.6.1     skrll 	{ SYS_shmget, 0, (sy_call_t *)sys_shmget },
    144  1.25.6.1     skrll 	{ SYS_____semctl50, 0, (sy_call_t *)sys_____semctl50 },
    145  1.25.6.1     skrll 	{ SYS_semget, 0, (sy_call_t *)sys_semget },
    146  1.25.6.1     skrll 	{ SYS_semop, 0, (sy_call_t *)sys_semop },
    147  1.25.6.1     skrll 	{ SYS_semconfig, 0, (sy_call_t *)sys_semconfig },
    148  1.25.6.1     skrll 	{ SYS___msgctl50, 0, (sy_call_t *)sys___msgctl50 },
    149  1.25.6.1     skrll 	{ SYS_msgget, 0, (sy_call_t *)sys_msgget },
    150  1.25.6.1     skrll 	{ SYS_msgsnd, 0, (sy_call_t *)sys_msgsnd },
    151  1.25.6.1     skrll 	{ SYS_msgrcv, 0, (sy_call_t *)sys_msgrcv },
    152  1.25.6.1     skrll 	{ 0, 0, NULL }
    153  1.25.6.1     skrll };
    154  1.25.6.1     skrll 
    155  1.25.6.1     skrll static int
    156  1.25.6.1     skrll sysv_ipc_modcmd(modcmd_t cmd, void *arg)
    157  1.25.6.1     skrll {
    158  1.25.6.1     skrll 	int error = 0;
    159  1.25.6.1     skrll 
    160  1.25.6.1     skrll 	switch (cmd) {
    161  1.25.6.1     skrll 	case MODULE_CMD_INIT:
    162  1.25.6.1     skrll 		/* Link the system calls */
    163  1.25.6.1     skrll 		error = syscall_establish(NULL, sysvipc_syscalls);
    164  1.25.6.1     skrll 
    165  1.25.6.1     skrll 		/* Initialize all sysctl sub-trees */
    166  1.25.6.1     skrll #ifdef _MODULE
    167  1.25.6.1     skrll 		sysctl_ipc_setup(&sysctl_sysvipc_clog);
    168  1.25.6.1     skrll #ifdef	SYSVMSG
    169  1.25.6.1     skrll 		sysctl_ipc_msg_setup(&sysctl_sysvipc_clog);
    170  1.25.6.1     skrll #endif
    171  1.25.6.1     skrll #ifdef	SYSVSHM
    172  1.25.6.1     skrll 		sysctl_ipc_shm_setup(&sysctl_sysvipc_clog);
    173  1.25.6.1     skrll #endif
    174  1.25.6.1     skrll #ifdef	SYSVSEM
    175  1.25.6.1     skrll 		sysctl_ipc_sem_setup(&sysctl_sysvipc_clog);
    176  1.25.6.1     skrll #endif
    177  1.25.6.1     skrll 		/* Assume no compat sysctl routine for now */
    178  1.25.6.1     skrll 		kern_sysvipc50_sysctl_p = NULL;
    179  1.25.6.1     skrll 
    180  1.25.6.1     skrll 		/* Initialize each sub-component */
    181  1.25.6.1     skrll #ifdef SYSVSHM
    182  1.25.6.1     skrll 		shminit();
    183  1.25.6.1     skrll #endif
    184  1.25.6.1     skrll #ifdef SYSVSEM
    185  1.25.6.1     skrll 		seminit();
    186  1.25.6.1     skrll #endif
    187  1.25.6.1     skrll #ifdef SYSVMSG
    188  1.25.6.1     skrll 		msginit();
    189  1.25.6.1     skrll #endif
    190  1.25.6.1     skrll #endif /* _MODULE */
    191  1.25.6.1     skrll 		break;
    192  1.25.6.1     skrll 	case MODULE_CMD_FINI:
    193  1.25.6.1     skrll 		/*
    194  1.25.6.1     skrll 		 * Make sure no subcomponents are active.  Each one
    195  1.25.6.1     skrll 		 * tells us if it is busy, and if it was _not_ busy,
    196  1.25.6.1     skrll 		 * we assume it has already done its own clean-up.
    197  1.25.6.1     skrll 		 * So we might need to re-init any components that
    198  1.25.6.1     skrll 		 * are successfully fini'd if we find one that is
    199  1.25.6.1     skrll 		 * still busy.
    200  1.25.6.1     skrll 		 */
    201  1.25.6.1     skrll #ifdef SYSVSHM
    202  1.25.6.1     skrll 		if (shmfini()) {
    203  1.25.6.1     skrll 			return EBUSY;
    204  1.25.6.1     skrll 		}
    205  1.25.6.1     skrll #endif
    206  1.25.6.1     skrll #ifdef SYSVSEM
    207  1.25.6.1     skrll 		if (semfini()) {
    208  1.25.6.1     skrll #ifdef SYSVSHM
    209  1.25.6.1     skrll 			shminit();
    210  1.25.6.1     skrll #endif
    211  1.25.6.1     skrll 			return EBUSY;
    212  1.25.6.1     skrll 		}
    213  1.25.6.1     skrll #endif
    214  1.25.6.1     skrll #ifdef SYSVMSG
    215  1.25.6.1     skrll 		if (msgfini()) {
    216  1.25.6.1     skrll #ifdef SYSVSEM
    217  1.25.6.1     skrll 			seminit();
    218  1.25.6.1     skrll #endif
    219  1.25.6.1     skrll #ifdef SYSVSHM
    220  1.25.6.1     skrll 			shminit();
    221      1.22  christos #endif
    222  1.25.6.1     skrll 			return EBUSY;
    223  1.25.6.1     skrll 		}
    224  1.25.6.1     skrll #endif
    225  1.25.6.1     skrll 
    226  1.25.6.1     skrll 		/* Unlink the system calls. */
    227  1.25.6.1     skrll 		error = syscall_disestablish(NULL, sysvipc_syscalls);
    228  1.25.6.1     skrll 		if (error)
    229  1.25.6.1     skrll 			return error;
    230  1.25.6.1     skrll 
    231  1.25.6.1     skrll #ifdef _MODULE
    232  1.25.6.1     skrll 		/* Remove the sysctl sub-trees */
    233  1.25.6.1     skrll 		sysctl_teardown(&sysctl_sysvipc_clog);
    234  1.25.6.1     skrll #endif
    235  1.25.6.1     skrll 
    236  1.25.6.1     skrll 		/* Remove the kauth listener */
    237  1.25.6.1     skrll 		sysvipcfini();
    238  1.25.6.1     skrll 		break;
    239  1.25.6.1     skrll 	default:
    240  1.25.6.1     skrll 		return ENOTTY;
    241  1.25.6.1     skrll 	}
    242  1.25.6.1     skrll 	return error;
    243  1.25.6.1     skrll }
    244  1.25.6.1     skrll 
    245  1.25.6.1     skrll void
    246  1.25.6.1     skrll sysvipc50_set_compat_sysctl(int (*compat_sysctl)(SYSCTLFN_PROTO))
    247  1.25.6.1     skrll {
    248  1.25.6.1     skrll 
    249  1.25.6.1     skrll 	kern_sysvipc50_sysctl_p = compat_sysctl;
    250  1.25.6.1     skrll }
    251      1.22  christos 
    252      1.24      elad static kauth_listener_t sysvipc_listener = NULL;
    253       1.1       cgd 
    254      1.24      elad static int
    255      1.24      elad sysvipc_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
    256      1.24      elad     void *arg0, void *arg1, void *arg2, void *arg3)
    257       1.1       cgd {
    258      1.12   mycroft 	mode_t mask;
    259      1.17      elad 	int ismember = 0;
    260      1.24      elad 	struct ipc_perm *perm;
    261      1.24      elad 	int mode;
    262      1.24      elad 	enum kauth_system_req req;
    263      1.24      elad 
    264      1.24      elad 	req = (enum kauth_system_req)arg0;
    265      1.24      elad 
    266      1.24      elad 	if (!(action == KAUTH_SYSTEM_SYSVIPC &&
    267      1.24      elad 	      req == KAUTH_REQ_SYSTEM_SYSVIPC_BYPASS))
    268      1.24      elad 		return KAUTH_RESULT_DEFER;
    269      1.12   mycroft 
    270      1.24      elad 	perm = arg1;
    271      1.24      elad 	mode = (int)(uintptr_t)arg2;
    272       1.1       cgd 
    273       1.9   mycroft 	if (mode == IPC_M) {
    274      1.17      elad 		if (kauth_cred_geteuid(cred) == perm->uid ||
    275      1.17      elad 		    kauth_cred_geteuid(cred) == perm->cuid)
    276      1.24      elad 			return (KAUTH_RESULT_ALLOW);
    277      1.24      elad 		return (KAUTH_RESULT_DEFER); /* EPERM */
    278       1.1       cgd 	}
    279       1.4   hpeyerl 
    280      1.12   mycroft 	mask = 0;
    281      1.12   mycroft 
    282      1.17      elad 	if (kauth_cred_geteuid(cred) == perm->uid ||
    283      1.17      elad 	    kauth_cred_geteuid(cred) == perm->cuid) {
    284      1.12   mycroft 		if (mode & IPC_R)
    285      1.12   mycroft 			mask |= S_IRUSR;
    286      1.12   mycroft 		if (mode & IPC_W)
    287      1.12   mycroft 			mask |= S_IWUSR;
    288      1.24      elad 		return ((perm->mode & mask) == mask ? KAUTH_RESULT_ALLOW : KAUTH_RESULT_DEFER /* EACCES */);
    289      1.12   mycroft 	}
    290      1.12   mycroft 
    291      1.17      elad 	if (kauth_cred_getegid(cred) == perm->gid ||
    292      1.17      elad 	    (kauth_cred_ismember_gid(cred, perm->gid, &ismember) == 0 && ismember) ||
    293      1.17      elad 	    kauth_cred_getegid(cred) == perm->cgid ||
    294      1.17      elad 	    (kauth_cred_ismember_gid(cred, perm->cgid, &ismember) == 0 && ismember)) {
    295      1.12   mycroft 		if (mode & IPC_R)
    296      1.12   mycroft 			mask |= S_IRGRP;
    297      1.12   mycroft 		if (mode & IPC_W)
    298      1.12   mycroft 			mask |= S_IWGRP;
    299      1.24      elad 		return ((perm->mode & mask) == mask ? KAUTH_RESULT_ALLOW : KAUTH_RESULT_DEFER /* EACCES */);
    300      1.12   mycroft 	}
    301      1.12   mycroft 
    302      1.12   mycroft 	if (mode & IPC_R)
    303      1.12   mycroft 		mask |= S_IROTH;
    304      1.12   mycroft 	if (mode & IPC_W)
    305      1.12   mycroft 		mask |= S_IWOTH;
    306      1.24      elad 	return ((perm->mode & mask) == mask ? KAUTH_RESULT_ALLOW : KAUTH_RESULT_DEFER /* EACCES */);
    307      1.24      elad }
    308      1.24      elad 
    309      1.24      elad /*
    310      1.24      elad  * Check for ipc permission
    311      1.24      elad  */
    312      1.24      elad 
    313      1.24      elad int
    314      1.24      elad ipcperm(kauth_cred_t cred, struct ipc_perm *perm, int mode)
    315      1.24      elad {
    316      1.24      elad 	int error;
    317      1.24      elad 
    318      1.24      elad 	error = kauth_authorize_system(cred, KAUTH_SYSTEM_SYSVIPC,
    319      1.24      elad 	    KAUTH_REQ_SYSTEM_SYSVIPC_BYPASS, perm, KAUTH_ARG(mode), NULL);
    320      1.24      elad 	if (error == 0)
    321      1.24      elad 		return (0);
    322      1.24      elad 
    323      1.24      elad 	/* Adjust EPERM and EACCES errors until there's a better way to do this. */
    324      1.24      elad 	if (mode != IPC_M)
    325      1.24      elad 		error = EACCES;
    326      1.24      elad 
    327      1.24      elad 	return error;
    328      1.24      elad }
    329      1.24      elad 
    330      1.24      elad void
    331  1.25.6.1     skrll sysvipcfini(void)
    332  1.25.6.1     skrll {
    333  1.25.6.1     skrll 
    334  1.25.6.1     skrll 	KASSERT(sysvipc_listener != NULL);
    335  1.25.6.1     skrll 	kauth_unlisten_scope(sysvipc_listener);
    336  1.25.6.1     skrll }
    337  1.25.6.1     skrll 
    338  1.25.6.1     skrll void
    339      1.24      elad sysvipcinit(void)
    340      1.24      elad {
    341      1.24      elad 
    342      1.24      elad 	if (sysvipc_listener != NULL)
    343      1.24      elad 		return;
    344      1.24      elad 
    345      1.24      elad 	sysvipc_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM,
    346      1.24      elad 	    sysvipc_listener_cb, NULL);
    347       1.1       cgd }
    348      1.18  christos 
    349      1.18  christos static int
    350      1.18  christos sysctl_kern_sysvipc(SYSCTLFN_ARGS)
    351      1.18  christos {
    352      1.18  christos 	void *where = oldp;
    353      1.23     rmind 	size_t sz, *sizep = oldlenp;
    354      1.18  christos #ifdef SYSVMSG
    355      1.18  christos 	struct msg_sysctl_info *msgsi = NULL;
    356      1.18  christos #endif
    357      1.18  christos #ifdef SYSVSEM
    358      1.18  christos 	struct sem_sysctl_info *semsi = NULL;
    359      1.18  christos #endif
    360      1.18  christos #ifdef SYSVSHM
    361      1.18  christos 	struct shm_sysctl_info *shmsi = NULL;
    362      1.18  christos #endif
    363      1.18  christos 	size_t infosize, dssize, tsize, buflen;
    364      1.18  christos 	void *bf = NULL;
    365      1.18  christos 	char *start;
    366      1.18  christos 	int32_t nds;
    367      1.18  christos 	int i, error, ret;
    368      1.18  christos 
    369  1.25.6.1     skrll /*
    370  1.25.6.1     skrll  * If compat_sysv module has loaded the compat sysctl, call it.  If
    371  1.25.6.1     skrll  * it handles the request completely (either success or error), just
    372  1.25.6.1     skrll  * return.  Otherwise fallthrough to the non-compat_sysv sysctl code.
    373  1.25.6.1     skrll  */
    374  1.25.6.1     skrll 	if (kern_sysvipc50_sysctl_p != NULL) {
    375  1.25.6.1     skrll 		error = (*kern_sysvipc50_sysctl_p)(SYSCTLFN_CALL(rnode));
    376  1.25.6.1     skrll 		if (error != EPASSTHROUGH)
    377  1.25.6.1     skrll 			return error;
    378      1.22  christos 	}
    379  1.25.6.1     skrll 
    380      1.18  christos 	if (namelen != 1)
    381      1.18  christos 		return EINVAL;
    382      1.18  christos 
    383      1.18  christos 	start = where;
    384      1.18  christos 	buflen = *sizep;
    385      1.18  christos 
    386      1.18  christos 	switch (*name) {
    387      1.18  christos 	case KERN_SYSVIPC_MSG_INFO:
    388      1.18  christos #ifdef SYSVMSG
    389      1.18  christos 		infosize = sizeof(msgsi->msginfo);
    390      1.18  christos 		nds = msginfo.msgmni;
    391      1.18  christos 		dssize = sizeof(msgsi->msgids[0]);
    392      1.18  christos 		break;
    393      1.18  christos #else
    394      1.18  christos 		return EINVAL;
    395      1.18  christos #endif
    396      1.18  christos 	case KERN_SYSVIPC_SEM_INFO:
    397      1.18  christos #ifdef SYSVSEM
    398      1.18  christos 		infosize = sizeof(semsi->seminfo);
    399      1.18  christos 		nds = seminfo.semmni;
    400      1.18  christos 		dssize = sizeof(semsi->semids[0]);
    401      1.18  christos 		break;
    402      1.18  christos #else
    403      1.18  christos 		return EINVAL;
    404      1.18  christos #endif
    405      1.18  christos 	case KERN_SYSVIPC_SHM_INFO:
    406      1.18  christos #ifdef SYSVSHM
    407      1.18  christos 		infosize = sizeof(shmsi->shminfo);
    408      1.18  christos 		nds = shminfo.shmmni;
    409      1.18  christos 		dssize = sizeof(shmsi->shmids[0]);
    410      1.18  christos 		break;
    411      1.18  christos #else
    412      1.18  christos 		return EINVAL;
    413      1.18  christos #endif
    414      1.18  christos 	default:
    415      1.18  christos 		return EINVAL;
    416      1.18  christos 	}
    417      1.18  christos 	/*
    418      1.18  christos 	 * Round infosize to 64 bit boundary if requesting more than just
    419      1.18  christos 	 * the info structure or getting the total data size.
    420      1.18  christos 	 */
    421      1.18  christos 	if (where == NULL || *sizep > infosize)
    422      1.18  christos 		infosize = roundup(infosize, sizeof(quad_t));
    423      1.18  christos 	tsize = infosize + nds * dssize;
    424      1.18  christos 
    425      1.18  christos 	/* Return just the total size required. */
    426      1.18  christos 	if (where == NULL) {
    427      1.18  christos 		*sizep = tsize;
    428      1.18  christos 		return 0;
    429      1.18  christos 	}
    430      1.18  christos 
    431      1.18  christos 	/* Not enough room for even the info struct. */
    432      1.18  christos 	if (buflen < infosize) {
    433      1.18  christos 		*sizep = 0;
    434      1.18  christos 		return ENOMEM;
    435      1.18  christos 	}
    436      1.23     rmind 	sz = min(tsize, buflen);
    437      1.23     rmind 	bf = kmem_zalloc(sz, KM_SLEEP);
    438      1.18  christos 
    439      1.18  christos 	switch (*name) {
    440      1.18  christos #ifdef SYSVMSG
    441      1.18  christos 	case KERN_SYSVIPC_MSG_INFO:
    442      1.18  christos 		msgsi = (struct msg_sysctl_info *)bf;
    443      1.18  christos 		msgsi->msginfo = msginfo;
    444      1.18  christos 		break;
    445      1.18  christos #endif
    446      1.18  christos #ifdef SYSVSEM
    447      1.18  christos 	case KERN_SYSVIPC_SEM_INFO:
    448      1.18  christos 		semsi = (struct sem_sysctl_info *)bf;
    449      1.18  christos 		semsi->seminfo = seminfo;
    450      1.18  christos 		break;
    451      1.18  christos #endif
    452      1.18  christos #ifdef SYSVSHM
    453      1.18  christos 	case KERN_SYSVIPC_SHM_INFO:
    454      1.18  christos 		shmsi = (struct shm_sysctl_info *)bf;
    455      1.18  christos 		shmsi->shminfo = shminfo;
    456      1.18  christos 		break;
    457      1.18  christos #endif
    458      1.18  christos 	}
    459      1.18  christos 	buflen -= infosize;
    460      1.18  christos 
    461      1.18  christos 	ret = 0;
    462      1.18  christos 	if (buflen > 0) {
    463      1.18  christos 		/* Fill in the IPC data structures.  */
    464      1.18  christos 		for (i = 0; i < nds; i++) {
    465      1.18  christos 			if (buflen < dssize) {
    466      1.18  christos 				ret = ENOMEM;
    467      1.18  christos 				break;
    468      1.18  christos 			}
    469      1.18  christos 			switch (*name) {
    470      1.18  christos #ifdef SYSVMSG
    471      1.18  christos 			case KERN_SYSVIPC_MSG_INFO:
    472      1.20        ad 				mutex_enter(&msgmutex);
    473      1.22  christos 				SYSCTL_FILL_MSG(msqs[i].msq_u, msgsi->msgids[i]);
    474      1.20        ad 				mutex_exit(&msgmutex);
    475      1.18  christos 				break;
    476      1.18  christos #endif
    477      1.18  christos #ifdef SYSVSEM
    478      1.18  christos 			case KERN_SYSVIPC_SEM_INFO:
    479      1.22  christos 				SYSCTL_FILL_SEM(sema[i], semsi->semids[i]);
    480      1.18  christos 				break;
    481      1.18  christos #endif
    482      1.18  christos #ifdef SYSVSHM
    483      1.18  christos 			case KERN_SYSVIPC_SHM_INFO:
    484      1.22  christos 				SYSCTL_FILL_SHM(shmsegs[i], shmsi->shmids[i]);
    485      1.18  christos 				break;
    486      1.18  christos #endif
    487      1.18  christos 			}
    488      1.18  christos 			buflen -= dssize;
    489      1.18  christos 		}
    490      1.18  christos 	}
    491      1.18  christos 	*sizep -= buflen;
    492      1.18  christos 	error = copyout(bf, start, *sizep);
    493      1.18  christos 	/* If copyout succeeded, use return code set earlier. */
    494      1.18  christos 	if (error == 0)
    495      1.18  christos 		error = ret;
    496      1.18  christos 	if (bf)
    497      1.23     rmind 		kmem_free(bf, sz);
    498      1.18  christos 	return error;
    499      1.18  christos }
    500      1.18  christos 
    501      1.18  christos SYSCTL_SETUP(sysctl_ipc_setup, "sysctl kern.ipc subtree setup")
    502      1.18  christos {
    503      1.18  christos 
    504      1.18  christos 	sysctl_createv(clog, 0, NULL, NULL,
    505      1.18  christos 		CTLFLAG_PERMANENT,
    506      1.18  christos 		CTLTYPE_NODE, "ipc",
    507      1.18  christos 		SYSCTL_DESCR("SysV IPC options"),
    508      1.18  christos 		NULL, 0, NULL, 0,
    509      1.18  christos 		CTL_KERN, KERN_SYSVIPC, CTL_EOL);
    510      1.18  christos 
    511      1.18  christos 	sysctl_createv(clog, 0, NULL, NULL,
    512      1.18  christos 		CTLFLAG_PERMANENT,
    513      1.18  christos 		CTLTYPE_STRUCT, "sysvipc_info",
    514      1.18  christos 		SYSCTL_DESCR("System V style IPC information"),
    515      1.18  christos 		sysctl_kern_sysvipc, 0, NULL, 0,
    516      1.18  christos 		CTL_KERN, KERN_SYSVIPC, KERN_SYSVIPC_INFO, CTL_EOL);
    517      1.18  christos }
    518