97c31dedde
Submitted by: jhb@
1583 lines
40 KiB
C
1583 lines
40 KiB
C
/*-
|
|
* Implementation of SVID messages
|
|
*
|
|
* Author: Daniel Boulet
|
|
*
|
|
* Copyright 1993 Daniel Boulet and RTMX Inc.
|
|
*
|
|
* This system call was implemented by Daniel Boulet under contract from RTMX.
|
|
*
|
|
* Redistribution and use in source forms, with and without modification,
|
|
* are permitted provided that this entire comment appears intact.
|
|
*
|
|
* Redistribution in binary form may occur without any restrictions.
|
|
* Obviously, it would be nice if you gave credit where credit is due
|
|
* but requiring it would be too onerous.
|
|
*
|
|
* This software is provided ``AS IS'' without any warranties of any kind.
|
|
*/
|
|
/*-
|
|
* Copyright (c) 2003-2005 McAfee, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed for the FreeBSD Project in part by McAfee
|
|
* Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
|
|
* contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
|
|
* program.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_compat.h"
|
|
#include "opt_sysvipc.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/module.h>
|
|
#include <sys/msg.h>
|
|
#include <sys/racct.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/syscallsubr.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/jail.h>
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
FEATURE(sysv_msg, "System V message queues support");
|
|
|
|
static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues");
|
|
|
|
static int msginit(void);
|
|
static int msgunload(void);
|
|
static int sysvmsg_modload(struct module *, int, void *);
|
|
|
|
#ifdef MSG_DEBUG
|
|
#define DPRINTF(a) printf a
|
|
#else
|
|
#define DPRINTF(a) (void)0
|
|
#endif
|
|
|
|
static void msg_freehdr(struct msg *msghdr);
|
|
|
|
#ifndef MSGSSZ
|
|
#define MSGSSZ 8 /* Each segment must be 2^N long */
|
|
#endif
|
|
#ifndef MSGSEG
|
|
#define MSGSEG 2048 /* must be less than 32767 */
|
|
#endif
|
|
#define MSGMAX (MSGSSZ*MSGSEG)
|
|
#ifndef MSGMNB
|
|
#define MSGMNB 2048 /* max # of bytes in a queue */
|
|
#endif
|
|
#ifndef MSGMNI
|
|
#define MSGMNI 40
|
|
#endif
|
|
#ifndef MSGTQL
|
|
#define MSGTQL 40
|
|
#endif
|
|
|
|
/*
|
|
* Based on the configuration parameters described in an SVR2 (yes, two)
|
|
* config(1m) man page.
|
|
*
|
|
* Each message is broken up and stored in segments that are msgssz bytes
|
|
* long. For efficiency reasons, this should be a power of two. Also,
|
|
* it doesn't make sense if it is less than 8 or greater than about 256.
|
|
* Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
|
|
* two between 8 and 1024 inclusive (and panic's if it isn't).
|
|
*/
|
|
struct msginfo msginfo = {
|
|
MSGMAX, /* max chars in a message */
|
|
MSGMNI, /* # of message queue identifiers */
|
|
MSGMNB, /* max chars in a queue */
|
|
MSGTQL, /* max messages in system */
|
|
MSGSSZ, /* size of a message segment */
|
|
/* (must be small power of 2 greater than 4) */
|
|
MSGSEG /* number of message segments */
|
|
};
|
|
|
|
/*
|
|
* macros to convert between msqid_ds's and msqid's.
|
|
* (specific to this implementation)
|
|
*/
|
|
#define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
|
|
#define MSQID_IX(id) ((id) & 0xffff)
|
|
#define MSQID_SEQ(id) (((id) >> 16) & 0xffff)
|
|
|
|
/*
|
|
* The rest of this file is specific to this particular implementation.
|
|
*/
|
|
|
|
struct msgmap {
|
|
short next; /* next segment in buffer */
|
|
/* -1 -> available */
|
|
/* 0..(MSGSEG-1) -> index of next segment */
|
|
};
|
|
|
|
#define MSG_LOCKED 01000 /* Is this msqid_ds locked? */
|
|
|
|
static int nfree_msgmaps; /* # of free map entries */
|
|
static short free_msgmaps; /* head of linked list of free map entries */
|
|
static struct msg *free_msghdrs;/* list of free msg headers */
|
|
static char *msgpool; /* MSGMAX byte long msg buffer pool */
|
|
static struct msgmap *msgmaps; /* MSGSEG msgmap structures */
|
|
static struct msg *msghdrs; /* MSGTQL msg headers */
|
|
static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */
|
|
static struct mtx msq_mtx; /* global mutex for message queues. */
|
|
|
|
static struct syscall_helper_data msg_syscalls[] = {
|
|
SYSCALL_INIT_HELPER(msgctl),
|
|
SYSCALL_INIT_HELPER(msgget),
|
|
SYSCALL_INIT_HELPER(msgsnd),
|
|
SYSCALL_INIT_HELPER(msgrcv),
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
SYSCALL_INIT_HELPER(msgsys),
|
|
SYSCALL_INIT_HELPER(freebsd7_msgctl),
|
|
#endif
|
|
SYSCALL_INIT_LAST
|
|
};
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
#include <compat/freebsd32/freebsd32.h>
|
|
#include <compat/freebsd32/freebsd32_ipc.h>
|
|
#include <compat/freebsd32/freebsd32_proto.h>
|
|
#include <compat/freebsd32/freebsd32_signal.h>
|
|
#include <compat/freebsd32/freebsd32_syscall.h>
|
|
#include <compat/freebsd32/freebsd32_util.h>
|
|
|
|
static struct syscall_helper_data msg32_syscalls[] = {
|
|
SYSCALL32_INIT_HELPER(freebsd32_msgctl),
|
|
SYSCALL32_INIT_HELPER(freebsd32_msgsnd),
|
|
SYSCALL32_INIT_HELPER(freebsd32_msgrcv),
|
|
SYSCALL32_INIT_HELPER(msgget),
|
|
SYSCALL32_INIT_HELPER(freebsd32_msgsys),
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl),
|
|
#endif
|
|
SYSCALL_INIT_LAST
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
msginit()
|
|
{
|
|
int i, error;
|
|
|
|
TUNABLE_INT_FETCH("kern.ipc.msgseg", &msginfo.msgseg);
|
|
TUNABLE_INT_FETCH("kern.ipc.msgssz", &msginfo.msgssz);
|
|
msginfo.msgmax = msginfo.msgseg * msginfo.msgssz;
|
|
TUNABLE_INT_FETCH("kern.ipc.msgmni", &msginfo.msgmni);
|
|
TUNABLE_INT_FETCH("kern.ipc.msgmnb", &msginfo.msgmnb);
|
|
TUNABLE_INT_FETCH("kern.ipc.msgtql", &msginfo.msgtql);
|
|
|
|
msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK);
|
|
msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK);
|
|
msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK);
|
|
msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG,
|
|
M_WAITOK);
|
|
|
|
/*
|
|
* msginfo.msgssz should be a power of two for efficiency reasons.
|
|
* It is also pretty silly if msginfo.msgssz is less than 8
|
|
* or greater than about 256 so ...
|
|
*/
|
|
|
|
i = 8;
|
|
while (i < 1024 && i != msginfo.msgssz)
|
|
i <<= 1;
|
|
if (i != msginfo.msgssz) {
|
|
DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz,
|
|
msginfo.msgssz));
|
|
panic("msginfo.msgssz not a small power of 2");
|
|
}
|
|
|
|
if (msginfo.msgseg > 32767) {
|
|
DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg));
|
|
panic("msginfo.msgseg > 32767");
|
|
}
|
|
|
|
for (i = 0; i < msginfo.msgseg; i++) {
|
|
if (i > 0)
|
|
msgmaps[i-1].next = i;
|
|
msgmaps[i].next = -1; /* implies entry is available */
|
|
}
|
|
free_msgmaps = 0;
|
|
nfree_msgmaps = msginfo.msgseg;
|
|
|
|
for (i = 0; i < msginfo.msgtql; i++) {
|
|
msghdrs[i].msg_type = 0;
|
|
if (i > 0)
|
|
msghdrs[i-1].msg_next = &msghdrs[i];
|
|
msghdrs[i].msg_next = NULL;
|
|
#ifdef MAC
|
|
mac_sysvmsg_init(&msghdrs[i]);
|
|
#endif
|
|
}
|
|
free_msghdrs = &msghdrs[0];
|
|
|
|
for (i = 0; i < msginfo.msgmni; i++) {
|
|
msqids[i].u.msg_qbytes = 0; /* implies entry is available */
|
|
msqids[i].u.msg_perm.seq = 0; /* reset to a known value */
|
|
msqids[i].u.msg_perm.mode = 0;
|
|
#ifdef MAC
|
|
mac_sysvmsq_init(&msqids[i]);
|
|
#endif
|
|
}
|
|
mtx_init(&msq_mtx, "msq", NULL, MTX_DEF);
|
|
|
|
error = syscall_helper_register(msg_syscalls);
|
|
if (error != 0)
|
|
return (error);
|
|
#ifdef COMPAT_FREEBSD32
|
|
error = syscall32_helper_register(msg32_syscalls);
|
|
if (error != 0)
|
|
return (error);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
msgunload()
|
|
{
|
|
struct msqid_kernel *msqkptr;
|
|
int msqid;
|
|
#ifdef MAC
|
|
int i;
|
|
#endif
|
|
|
|
syscall_helper_unregister(msg_syscalls);
|
|
#ifdef COMPAT_FREEBSD32
|
|
syscall32_helper_unregister(msg32_syscalls);
|
|
#endif
|
|
|
|
for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
|
|
/*
|
|
* Look for an unallocated and unlocked msqid_ds.
|
|
* msqid_ds's can be locked by msgsnd or msgrcv while
|
|
* they are copying the message in/out. We can't
|
|
* re-use the entry until they release it.
|
|
*/
|
|
msqkptr = &msqids[msqid];
|
|
if (msqkptr->u.msg_qbytes != 0 ||
|
|
(msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
|
|
break;
|
|
}
|
|
if (msqid != msginfo.msgmni)
|
|
return (EBUSY);
|
|
|
|
#ifdef MAC
|
|
for (i = 0; i < msginfo.msgtql; i++)
|
|
mac_sysvmsg_destroy(&msghdrs[i]);
|
|
for (msqid = 0; msqid < msginfo.msgmni; msqid++)
|
|
mac_sysvmsq_destroy(&msqids[msqid]);
|
|
#endif
|
|
free(msgpool, M_MSG);
|
|
free(msgmaps, M_MSG);
|
|
free(msghdrs, M_MSG);
|
|
free(msqids, M_MSG);
|
|
mtx_destroy(&msq_mtx);
|
|
return (0);
|
|
}
|
|
|
|
|
|
static int
|
|
sysvmsg_modload(struct module *module, int cmd, void *arg)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (cmd) {
|
|
case MOD_LOAD:
|
|
error = msginit();
|
|
if (error != 0)
|
|
msgunload();
|
|
break;
|
|
case MOD_UNLOAD:
|
|
error = msgunload();
|
|
break;
|
|
case MOD_SHUTDOWN:
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static moduledata_t sysvmsg_mod = {
|
|
"sysvmsg",
|
|
&sysvmsg_modload,
|
|
NULL
|
|
};
|
|
|
|
DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST);
|
|
MODULE_VERSION(sysvmsg, 1);
|
|
|
|
static void
|
|
msg_freehdr(msghdr)
|
|
struct msg *msghdr;
|
|
{
|
|
while (msghdr->msg_ts > 0) {
|
|
short next;
|
|
if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg)
|
|
panic("msghdr->msg_spot out of range");
|
|
next = msgmaps[msghdr->msg_spot].next;
|
|
msgmaps[msghdr->msg_spot].next = free_msgmaps;
|
|
free_msgmaps = msghdr->msg_spot;
|
|
nfree_msgmaps++;
|
|
msghdr->msg_spot = next;
|
|
if (msghdr->msg_ts >= msginfo.msgssz)
|
|
msghdr->msg_ts -= msginfo.msgssz;
|
|
else
|
|
msghdr->msg_ts = 0;
|
|
}
|
|
if (msghdr->msg_spot != -1)
|
|
panic("msghdr->msg_spot != -1");
|
|
msghdr->msg_next = free_msghdrs;
|
|
free_msghdrs = msghdr;
|
|
#ifdef MAC
|
|
mac_sysvmsg_cleanup(msghdr);
|
|
#endif
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct msgctl_args {
|
|
int msqid;
|
|
int cmd;
|
|
struct msqid_ds *buf;
|
|
};
|
|
#endif
|
|
int
|
|
msgctl(td, uap)
|
|
struct thread *td;
|
|
register struct msgctl_args *uap;
|
|
{
|
|
int msqid = uap->msqid;
|
|
int cmd = uap->cmd;
|
|
struct msqid_ds msqbuf;
|
|
int error;
|
|
|
|
DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf));
|
|
if (cmd == IPC_SET &&
|
|
(error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0)
|
|
return (error);
|
|
error = kern_msgctl(td, msqid, cmd, &msqbuf);
|
|
if (cmd == IPC_STAT && error == 0)
|
|
error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds));
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_msgctl(td, msqid, cmd, msqbuf)
|
|
struct thread *td;
|
|
int msqid;
|
|
int cmd;
|
|
struct msqid_ds *msqbuf;
|
|
{
|
|
int rval, error, msqix;
|
|
register struct msqid_kernel *msqkptr;
|
|
|
|
if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
|
|
return (ENOSYS);
|
|
|
|
msqix = IPCID_TO_IX(msqid);
|
|
|
|
if (msqix < 0 || msqix >= msginfo.msgmni) {
|
|
DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
|
|
msginfo.msgmni));
|
|
return (EINVAL);
|
|
}
|
|
|
|
msqkptr = &msqids[msqix];
|
|
|
|
mtx_lock(&msq_mtx);
|
|
if (msqkptr->u.msg_qbytes == 0) {
|
|
DPRINTF(("no such msqid\n"));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
|
|
DPRINTF(("wrong sequence number\n"));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
|
|
error = 0;
|
|
rval = 0;
|
|
|
|
switch (cmd) {
|
|
|
|
case IPC_RMID:
|
|
{
|
|
struct msg *msghdr;
|
|
if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
|
|
goto done2;
|
|
|
|
#ifdef MAC
|
|
/*
|
|
* Check that the thread has MAC access permissions to
|
|
* individual msghdrs. Note: We need to do this in a
|
|
* separate loop because the actual loop alters the
|
|
* msq/msghdr info as it progresses, and there is no going
|
|
* back if half the way through we discover that the
|
|
* thread cannot free a certain msghdr. The msq will get
|
|
* into an inconsistent state.
|
|
*/
|
|
for (msghdr = msqkptr->u.msg_first; msghdr != NULL;
|
|
msghdr = msghdr->msg_next) {
|
|
error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr);
|
|
if (error != 0)
|
|
goto done2;
|
|
}
|
|
#endif
|
|
|
|
racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1);
|
|
racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum);
|
|
racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes);
|
|
crfree(msqkptr->cred);
|
|
msqkptr->cred = NULL;
|
|
|
|
/* Free the message headers */
|
|
msghdr = msqkptr->u.msg_first;
|
|
while (msghdr != NULL) {
|
|
struct msg *msghdr_tmp;
|
|
|
|
/* Free the segments of each message */
|
|
msqkptr->u.msg_cbytes -= msghdr->msg_ts;
|
|
msqkptr->u.msg_qnum--;
|
|
msghdr_tmp = msghdr;
|
|
msghdr = msghdr->msg_next;
|
|
msg_freehdr(msghdr_tmp);
|
|
}
|
|
|
|
if (msqkptr->u.msg_cbytes != 0)
|
|
panic("msg_cbytes is screwed up");
|
|
if (msqkptr->u.msg_qnum != 0)
|
|
panic("msg_qnum is screwed up");
|
|
|
|
msqkptr->u.msg_qbytes = 0; /* Mark it as free */
|
|
|
|
#ifdef MAC
|
|
mac_sysvmsq_cleanup(msqkptr);
|
|
#endif
|
|
|
|
wakeup(msqkptr);
|
|
}
|
|
|
|
break;
|
|
|
|
case IPC_SET:
|
|
if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
|
|
goto done2;
|
|
if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) {
|
|
error = priv_check(td, PRIV_IPC_MSGSIZE);
|
|
if (error)
|
|
goto done2;
|
|
}
|
|
if (msqbuf->msg_qbytes > msginfo.msgmnb) {
|
|
DPRINTF(("can't increase msg_qbytes beyond %d"
|
|
"(truncating)\n", msginfo.msgmnb));
|
|
msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */
|
|
}
|
|
if (msqbuf->msg_qbytes == 0) {
|
|
DPRINTF(("can't reduce msg_qbytes to 0\n"));
|
|
error = EINVAL; /* non-standard errno! */
|
|
goto done2;
|
|
}
|
|
msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */
|
|
msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */
|
|
msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) |
|
|
(msqbuf->msg_perm.mode & 0777);
|
|
msqkptr->u.msg_qbytes = msqbuf->msg_qbytes;
|
|
msqkptr->u.msg_ctime = time_second;
|
|
break;
|
|
|
|
case IPC_STAT:
|
|
if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
|
|
DPRINTF(("requester doesn't have read access\n"));
|
|
goto done2;
|
|
}
|
|
*msqbuf = msqkptr->u;
|
|
break;
|
|
|
|
default:
|
|
DPRINTF(("invalid command %d\n", cmd));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
|
|
if (error == 0)
|
|
td->td_retval[0] = rval;
|
|
done2:
|
|
mtx_unlock(&msq_mtx);
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct msgget_args {
|
|
key_t key;
|
|
int msgflg;
|
|
};
|
|
#endif
|
|
int
|
|
msgget(td, uap)
|
|
struct thread *td;
|
|
register struct msgget_args *uap;
|
|
{
|
|
int msqid, error = 0;
|
|
int key = uap->key;
|
|
int msgflg = uap->msgflg;
|
|
struct ucred *cred = td->td_ucred;
|
|
register struct msqid_kernel *msqkptr = NULL;
|
|
|
|
DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg));
|
|
|
|
if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
|
|
return (ENOSYS);
|
|
|
|
mtx_lock(&msq_mtx);
|
|
if (key != IPC_PRIVATE) {
|
|
for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
|
|
msqkptr = &msqids[msqid];
|
|
if (msqkptr->u.msg_qbytes != 0 &&
|
|
msqkptr->u.msg_perm.key == key)
|
|
break;
|
|
}
|
|
if (msqid < msginfo.msgmni) {
|
|
DPRINTF(("found public key\n"));
|
|
if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) {
|
|
DPRINTF(("not exclusive\n"));
|
|
error = EEXIST;
|
|
goto done2;
|
|
}
|
|
if ((error = ipcperm(td, &msqkptr->u.msg_perm,
|
|
msgflg & 0700))) {
|
|
DPRINTF(("requester doesn't have 0%o access\n",
|
|
msgflg & 0700));
|
|
goto done2;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_sysvmsq_check_msqget(cred, msqkptr);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
DPRINTF(("need to allocate the msqid_ds\n"));
|
|
if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) {
|
|
for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
|
|
/*
|
|
* Look for an unallocated and unlocked msqid_ds.
|
|
* msqid_ds's can be locked by msgsnd or msgrcv while
|
|
* they are copying the message in/out. We can't
|
|
* re-use the entry until they release it.
|
|
*/
|
|
msqkptr = &msqids[msqid];
|
|
if (msqkptr->u.msg_qbytes == 0 &&
|
|
(msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0)
|
|
break;
|
|
}
|
|
if (msqid == msginfo.msgmni) {
|
|
DPRINTF(("no more msqid_ds's available\n"));
|
|
error = ENOSPC;
|
|
goto done2;
|
|
}
|
|
PROC_LOCK(td->td_proc);
|
|
error = racct_add(td->td_proc, RACCT_NMSGQ, 1);
|
|
PROC_UNLOCK(td->td_proc);
|
|
if (error != 0) {
|
|
error = ENOSPC;
|
|
goto done2;
|
|
}
|
|
DPRINTF(("msqid %d is available\n", msqid));
|
|
msqkptr->u.msg_perm.key = key;
|
|
msqkptr->u.msg_perm.cuid = cred->cr_uid;
|
|
msqkptr->u.msg_perm.uid = cred->cr_uid;
|
|
msqkptr->u.msg_perm.cgid = cred->cr_gid;
|
|
msqkptr->u.msg_perm.gid = cred->cr_gid;
|
|
msqkptr->u.msg_perm.mode = (msgflg & 0777);
|
|
msqkptr->cred = crhold(cred);
|
|
/* Make sure that the returned msqid is unique */
|
|
msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff;
|
|
msqkptr->u.msg_first = NULL;
|
|
msqkptr->u.msg_last = NULL;
|
|
msqkptr->u.msg_cbytes = 0;
|
|
msqkptr->u.msg_qnum = 0;
|
|
msqkptr->u.msg_qbytes = msginfo.msgmnb;
|
|
msqkptr->u.msg_lspid = 0;
|
|
msqkptr->u.msg_lrpid = 0;
|
|
msqkptr->u.msg_stime = 0;
|
|
msqkptr->u.msg_rtime = 0;
|
|
msqkptr->u.msg_ctime = time_second;
|
|
#ifdef MAC
|
|
mac_sysvmsq_create(cred, msqkptr);
|
|
#endif
|
|
} else {
|
|
DPRINTF(("didn't find it and wasn't asked to create it\n"));
|
|
error = ENOENT;
|
|
goto done2;
|
|
}
|
|
|
|
found:
|
|
/* Construct the unique msqid */
|
|
td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm);
|
|
done2:
|
|
mtx_unlock(&msq_mtx);
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct msgsnd_args {
|
|
int msqid;
|
|
const void *msgp;
|
|
size_t msgsz;
|
|
int msgflg;
|
|
};
|
|
#endif
|
|
int
|
|
kern_msgsnd(td, msqid, msgp, msgsz, msgflg, mtype)
|
|
struct thread *td;
|
|
int msqid;
|
|
const void *msgp; /* XXX msgp is actually mtext. */
|
|
size_t msgsz;
|
|
int msgflg;
|
|
long mtype;
|
|
{
|
|
int msqix, segs_needed, error = 0;
|
|
register struct msqid_kernel *msqkptr;
|
|
register struct msg *msghdr;
|
|
short next;
|
|
size_t saved_msgsz;
|
|
|
|
if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
|
|
return (ENOSYS);
|
|
|
|
mtx_lock(&msq_mtx);
|
|
msqix = IPCID_TO_IX(msqid);
|
|
|
|
if (msqix < 0 || msqix >= msginfo.msgmni) {
|
|
DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
|
|
msginfo.msgmni));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
|
|
msqkptr = &msqids[msqix];
|
|
if (msqkptr->u.msg_qbytes == 0) {
|
|
DPRINTF(("no such message queue id\n"));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
|
|
DPRINTF(("wrong sequence number\n"));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
|
|
if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) {
|
|
DPRINTF(("requester doesn't have write access\n"));
|
|
goto done2;
|
|
}
|
|
|
|
#ifdef MAC
|
|
error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
|
|
PROC_LOCK(td->td_proc);
|
|
if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) {
|
|
PROC_UNLOCK(td->td_proc);
|
|
error = EAGAIN;
|
|
goto done2;
|
|
}
|
|
saved_msgsz = msgsz;
|
|
if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) {
|
|
racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
|
|
PROC_UNLOCK(td->td_proc);
|
|
error = EAGAIN;
|
|
goto done2;
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
|
|
segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz;
|
|
DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz,
|
|
msginfo.msgssz, segs_needed));
|
|
for (;;) {
|
|
int need_more_resources = 0;
|
|
|
|
/*
|
|
* check msgsz
|
|
* (inside this loop in case msg_qbytes changes while we sleep)
|
|
*/
|
|
|
|
if (msgsz > msqkptr->u.msg_qbytes) {
|
|
DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n"));
|
|
error = EINVAL;
|
|
goto done3;
|
|
}
|
|
|
|
if (msqkptr->u.msg_perm.mode & MSG_LOCKED) {
|
|
DPRINTF(("msqid is locked\n"));
|
|
need_more_resources = 1;
|
|
}
|
|
if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) {
|
|
DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n"));
|
|
need_more_resources = 1;
|
|
}
|
|
if (segs_needed > nfree_msgmaps) {
|
|
DPRINTF(("segs_needed > nfree_msgmaps\n"));
|
|
need_more_resources = 1;
|
|
}
|
|
if (free_msghdrs == NULL) {
|
|
DPRINTF(("no more msghdrs\n"));
|
|
need_more_resources = 1;
|
|
}
|
|
|
|
if (need_more_resources) {
|
|
int we_own_it;
|
|
|
|
if ((msgflg & IPC_NOWAIT) != 0) {
|
|
DPRINTF(("need more resources but caller "
|
|
"doesn't want to wait\n"));
|
|
error = EAGAIN;
|
|
goto done3;
|
|
}
|
|
|
|
if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) {
|
|
DPRINTF(("we don't own the msqid_ds\n"));
|
|
we_own_it = 0;
|
|
} else {
|
|
/* Force later arrivals to wait for our
|
|
request */
|
|
DPRINTF(("we own the msqid_ds\n"));
|
|
msqkptr->u.msg_perm.mode |= MSG_LOCKED;
|
|
we_own_it = 1;
|
|
}
|
|
DPRINTF(("msgsnd: goodnight\n"));
|
|
error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
|
|
"msgsnd", hz);
|
|
DPRINTF(("msgsnd: good morning, error=%d\n", error));
|
|
if (we_own_it)
|
|
msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
|
|
if (error == EWOULDBLOCK) {
|
|
DPRINTF(("msgsnd: timed out\n"));
|
|
continue;
|
|
}
|
|
if (error != 0) {
|
|
DPRINTF(("msgsnd: interrupted system call\n"));
|
|
error = EINTR;
|
|
goto done3;
|
|
}
|
|
|
|
/*
|
|
* Make sure that the msq queue still exists
|
|
*/
|
|
|
|
if (msqkptr->u.msg_qbytes == 0) {
|
|
DPRINTF(("msqid deleted\n"));
|
|
error = EIDRM;
|
|
goto done3;
|
|
}
|
|
|
|
} else {
|
|
DPRINTF(("got all the resources that we need\n"));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We have the resources that we need.
|
|
* Make sure!
|
|
*/
|
|
|
|
if (msqkptr->u.msg_perm.mode & MSG_LOCKED)
|
|
panic("msg_perm.mode & MSG_LOCKED");
|
|
if (segs_needed > nfree_msgmaps)
|
|
panic("segs_needed > nfree_msgmaps");
|
|
if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes)
|
|
panic("msgsz + msg_cbytes > msg_qbytes");
|
|
if (free_msghdrs == NULL)
|
|
panic("no more msghdrs");
|
|
|
|
/*
|
|
* Re-lock the msqid_ds in case we page-fault when copying in the
|
|
* message
|
|
*/
|
|
|
|
if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
|
|
panic("msqid_ds is already locked");
|
|
msqkptr->u.msg_perm.mode |= MSG_LOCKED;
|
|
|
|
/*
|
|
* Allocate a message header
|
|
*/
|
|
|
|
msghdr = free_msghdrs;
|
|
free_msghdrs = msghdr->msg_next;
|
|
msghdr->msg_spot = -1;
|
|
msghdr->msg_ts = msgsz;
|
|
msghdr->msg_type = mtype;
|
|
#ifdef MAC
|
|
/*
|
|
* XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here
|
|
* immediately? Or, should it be checked just before the msg is
|
|
* enqueued in the msgq (as it is done now)?
|
|
*/
|
|
mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr);
|
|
#endif
|
|
|
|
/*
|
|
* Allocate space for the message
|
|
*/
|
|
|
|
while (segs_needed > 0) {
|
|
if (nfree_msgmaps <= 0)
|
|
panic("not enough msgmaps");
|
|
if (free_msgmaps == -1)
|
|
panic("nil free_msgmaps");
|
|
next = free_msgmaps;
|
|
if (next <= -1)
|
|
panic("next too low #1");
|
|
if (next >= msginfo.msgseg)
|
|
panic("next out of range #1");
|
|
DPRINTF(("allocating segment %d to message\n", next));
|
|
free_msgmaps = msgmaps[next].next;
|
|
nfree_msgmaps--;
|
|
msgmaps[next].next = msghdr->msg_spot;
|
|
msghdr->msg_spot = next;
|
|
segs_needed--;
|
|
}
|
|
|
|
/*
|
|
* Validate the message type
|
|
*/
|
|
|
|
if (msghdr->msg_type < 1) {
|
|
msg_freehdr(msghdr);
|
|
msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
|
|
wakeup(msqkptr);
|
|
DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type));
|
|
error = EINVAL;
|
|
goto done3;
|
|
}
|
|
|
|
/*
|
|
* Copy in the message body
|
|
*/
|
|
|
|
next = msghdr->msg_spot;
|
|
while (msgsz > 0) {
|
|
size_t tlen;
|
|
if (msgsz > msginfo.msgssz)
|
|
tlen = msginfo.msgssz;
|
|
else
|
|
tlen = msgsz;
|
|
if (next <= -1)
|
|
panic("next too low #2");
|
|
if (next >= msginfo.msgseg)
|
|
panic("next out of range #2");
|
|
mtx_unlock(&msq_mtx);
|
|
if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz],
|
|
tlen)) != 0) {
|
|
mtx_lock(&msq_mtx);
|
|
DPRINTF(("error %d copying in message segment\n",
|
|
error));
|
|
msg_freehdr(msghdr);
|
|
msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
|
|
wakeup(msqkptr);
|
|
goto done3;
|
|
}
|
|
mtx_lock(&msq_mtx);
|
|
msgsz -= tlen;
|
|
msgp = (const char *)msgp + tlen;
|
|
next = msgmaps[next].next;
|
|
}
|
|
if (next != -1)
|
|
panic("didn't use all the msg segments");
|
|
|
|
/*
|
|
* We've got the message. Unlock the msqid_ds.
|
|
*/
|
|
|
|
msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
|
|
|
|
/*
|
|
* Make sure that the msqid_ds is still allocated.
|
|
*/
|
|
|
|
if (msqkptr->u.msg_qbytes == 0) {
|
|
msg_freehdr(msghdr);
|
|
wakeup(msqkptr);
|
|
error = EIDRM;
|
|
goto done3;
|
|
}
|
|
|
|
#ifdef MAC
|
|
/*
|
|
* Note: Since the task/thread allocates the msghdr and usually
|
|
* primes it with its own MAC label, for a majority of policies, it
|
|
* won't be necessary to check whether the msghdr has access
|
|
* permissions to the msgq. The mac_sysvmsq_check_msqsnd check would
|
|
* suffice in that case. However, this hook may be required where
|
|
* individual policies derive a non-identical label for the msghdr
|
|
* from the current thread label and may want to check the msghdr
|
|
* enqueue permissions, along with read/write permissions to the
|
|
* msgq.
|
|
*/
|
|
error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr);
|
|
if (error != 0) {
|
|
msg_freehdr(msghdr);
|
|
wakeup(msqkptr);
|
|
goto done3;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Put the message into the queue
|
|
*/
|
|
if (msqkptr->u.msg_first == NULL) {
|
|
msqkptr->u.msg_first = msghdr;
|
|
msqkptr->u.msg_last = msghdr;
|
|
} else {
|
|
msqkptr->u.msg_last->msg_next = msghdr;
|
|
msqkptr->u.msg_last = msghdr;
|
|
}
|
|
msqkptr->u.msg_last->msg_next = NULL;
|
|
|
|
msqkptr->u.msg_cbytes += msghdr->msg_ts;
|
|
msqkptr->u.msg_qnum++;
|
|
msqkptr->u.msg_lspid = td->td_proc->p_pid;
|
|
msqkptr->u.msg_stime = time_second;
|
|
|
|
wakeup(msqkptr);
|
|
td->td_retval[0] = 0;
|
|
done3:
|
|
if (error != 0) {
|
|
PROC_LOCK(td->td_proc);
|
|
racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
|
|
racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz);
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
done2:
|
|
mtx_unlock(&msq_mtx);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
msgsnd(td, uap)
|
|
struct thread *td;
|
|
register struct msgsnd_args *uap;
|
|
{
|
|
int error;
|
|
long mtype;
|
|
|
|
DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp,
|
|
uap->msgsz, uap->msgflg));
|
|
|
|
if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) {
|
|
DPRINTF(("error %d copying the message type\n", error));
|
|
return (error);
|
|
}
|
|
return (kern_msgsnd(td, uap->msqid,
|
|
(const char *)uap->msgp + sizeof(mtype),
|
|
uap->msgsz, uap->msgflg, mtype));
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct msgrcv_args {
|
|
int msqid;
|
|
void *msgp;
|
|
size_t msgsz;
|
|
long msgtyp;
|
|
int msgflg;
|
|
};
|
|
#endif
|
|
int
|
|
kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype)
|
|
struct thread *td;
|
|
int msqid;
|
|
void *msgp; /* XXX msgp is actually mtext. */
|
|
size_t msgsz;
|
|
long msgtyp;
|
|
int msgflg;
|
|
long *mtype;
|
|
{
|
|
size_t len;
|
|
register struct msqid_kernel *msqkptr;
|
|
register struct msg *msghdr;
|
|
int msqix, error = 0;
|
|
short next;
|
|
|
|
if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
|
|
return (ENOSYS);
|
|
|
|
msqix = IPCID_TO_IX(msqid);
|
|
|
|
if (msqix < 0 || msqix >= msginfo.msgmni) {
|
|
DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
|
|
msginfo.msgmni));
|
|
return (EINVAL);
|
|
}
|
|
|
|
msqkptr = &msqids[msqix];
|
|
mtx_lock(&msq_mtx);
|
|
if (msqkptr->u.msg_qbytes == 0) {
|
|
DPRINTF(("no such message queue id\n"));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
|
|
DPRINTF(("wrong sequence number\n"));
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
|
|
if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
|
|
DPRINTF(("requester doesn't have read access\n"));
|
|
goto done2;
|
|
}
|
|
|
|
#ifdef MAC
|
|
error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
|
|
msghdr = NULL;
|
|
while (msghdr == NULL) {
|
|
if (msgtyp == 0) {
|
|
msghdr = msqkptr->u.msg_first;
|
|
if (msghdr != NULL) {
|
|
if (msgsz < msghdr->msg_ts &&
|
|
(msgflg & MSG_NOERROR) == 0) {
|
|
DPRINTF(("first message on the queue "
|
|
"is too big (want %zu, got %d)\n",
|
|
msgsz, msghdr->msg_ts));
|
|
error = E2BIG;
|
|
goto done2;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_sysvmsq_check_msgrcv(td->td_ucred,
|
|
msghdr);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
if (msqkptr->u.msg_first == msqkptr->u.msg_last) {
|
|
msqkptr->u.msg_first = NULL;
|
|
msqkptr->u.msg_last = NULL;
|
|
} else {
|
|
msqkptr->u.msg_first = msghdr->msg_next;
|
|
if (msqkptr->u.msg_first == NULL)
|
|
panic("msg_first/last screwed up #1");
|
|
}
|
|
}
|
|
} else {
|
|
struct msg *previous;
|
|
struct msg **prev;
|
|
|
|
previous = NULL;
|
|
prev = &(msqkptr->u.msg_first);
|
|
while ((msghdr = *prev) != NULL) {
|
|
/*
|
|
* Is this message's type an exact match or is
|
|
* this message's type less than or equal to
|
|
* the absolute value of a negative msgtyp?
|
|
* Note that the second half of this test can
|
|
* NEVER be true if msgtyp is positive since
|
|
* msg_type is always positive!
|
|
*/
|
|
|
|
if (msgtyp == msghdr->msg_type ||
|
|
msghdr->msg_type <= -msgtyp) {
|
|
DPRINTF(("found message type %ld, "
|
|
"requested %ld\n",
|
|
msghdr->msg_type, msgtyp));
|
|
if (msgsz < msghdr->msg_ts &&
|
|
(msgflg & MSG_NOERROR) == 0) {
|
|
DPRINTF(("requested message "
|
|
"on the queue is too big "
|
|
"(want %zu, got %hu)\n",
|
|
msgsz, msghdr->msg_ts));
|
|
error = E2BIG;
|
|
goto done2;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_sysvmsq_check_msgrcv(
|
|
td->td_ucred, msghdr);
|
|
if (error != 0)
|
|
goto done2;
|
|
#endif
|
|
*prev = msghdr->msg_next;
|
|
if (msghdr == msqkptr->u.msg_last) {
|
|
if (previous == NULL) {
|
|
if (prev !=
|
|
&msqkptr->u.msg_first)
|
|
panic("msg_first/last screwed up #2");
|
|
msqkptr->u.msg_first =
|
|
NULL;
|
|
msqkptr->u.msg_last =
|
|
NULL;
|
|
} else {
|
|
if (prev ==
|
|
&msqkptr->u.msg_first)
|
|
panic("msg_first/last screwed up #3");
|
|
msqkptr->u.msg_last =
|
|
previous;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
previous = msghdr;
|
|
prev = &(msghdr->msg_next);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We've either extracted the msghdr for the appropriate
|
|
* message or there isn't one.
|
|
* If there is one then bail out of this loop.
|
|
*/
|
|
|
|
if (msghdr != NULL)
|
|
break;
|
|
|
|
/*
|
|
* Hmph! No message found. Does the user want to wait?
|
|
*/
|
|
|
|
if ((msgflg & IPC_NOWAIT) != 0) {
|
|
DPRINTF(("no appropriate message found (msgtyp=%ld)\n",
|
|
msgtyp));
|
|
/* The SVID says to return ENOMSG. */
|
|
error = ENOMSG;
|
|
goto done2;
|
|
}
|
|
|
|
/*
|
|
* Wait for something to happen
|
|
*/
|
|
|
|
DPRINTF(("msgrcv: goodnight\n"));
|
|
error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
|
|
"msgrcv", 0);
|
|
DPRINTF(("msgrcv: good morning (error=%d)\n", error));
|
|
|
|
if (error != 0) {
|
|
DPRINTF(("msgrcv: interrupted system call\n"));
|
|
error = EINTR;
|
|
goto done2;
|
|
}
|
|
|
|
/*
|
|
* Make sure that the msq queue still exists
|
|
*/
|
|
|
|
if (msqkptr->u.msg_qbytes == 0 ||
|
|
msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
|
|
DPRINTF(("msqid deleted\n"));
|
|
error = EIDRM;
|
|
goto done2;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return the message to the user.
|
|
*
|
|
* First, do the bookkeeping (before we risk being interrupted).
|
|
*/
|
|
|
|
msqkptr->u.msg_cbytes -= msghdr->msg_ts;
|
|
msqkptr->u.msg_qnum--;
|
|
msqkptr->u.msg_lrpid = td->td_proc->p_pid;
|
|
msqkptr->u.msg_rtime = time_second;
|
|
|
|
racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1);
|
|
racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts);
|
|
|
|
/*
|
|
* Make msgsz the actual amount that we'll be returning.
|
|
* Note that this effectively truncates the message if it is too long
|
|
* (since msgsz is never increased).
|
|
*/
|
|
|
|
DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz,
|
|
msghdr->msg_ts));
|
|
if (msgsz > msghdr->msg_ts)
|
|
msgsz = msghdr->msg_ts;
|
|
*mtype = msghdr->msg_type;
|
|
|
|
/*
|
|
* Return the segments to the user
|
|
*/
|
|
|
|
next = msghdr->msg_spot;
|
|
for (len = 0; len < msgsz; len += msginfo.msgssz) {
|
|
size_t tlen;
|
|
|
|
if (msgsz - len > msginfo.msgssz)
|
|
tlen = msginfo.msgssz;
|
|
else
|
|
tlen = msgsz - len;
|
|
if (next <= -1)
|
|
panic("next too low #3");
|
|
if (next >= msginfo.msgseg)
|
|
panic("next out of range #3");
|
|
mtx_unlock(&msq_mtx);
|
|
error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen);
|
|
mtx_lock(&msq_mtx);
|
|
if (error != 0) {
|
|
DPRINTF(("error (%d) copying out message segment\n",
|
|
error));
|
|
msg_freehdr(msghdr);
|
|
wakeup(msqkptr);
|
|
goto done2;
|
|
}
|
|
msgp = (char *)msgp + tlen;
|
|
next = msgmaps[next].next;
|
|
}
|
|
|
|
/*
|
|
* Done, return the actual number of bytes copied out.
|
|
*/
|
|
|
|
msg_freehdr(msghdr);
|
|
wakeup(msqkptr);
|
|
td->td_retval[0] = msgsz;
|
|
done2:
|
|
mtx_unlock(&msq_mtx);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
msgrcv(td, uap)
|
|
struct thread *td;
|
|
register struct msgrcv_args *uap;
|
|
{
|
|
int error;
|
|
long mtype;
|
|
|
|
DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid,
|
|
uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg));
|
|
|
|
if ((error = kern_msgrcv(td, uap->msqid,
|
|
(char *)uap->msgp + sizeof(mtype), uap->msgsz,
|
|
uap->msgtyp, uap->msgflg, &mtype)) != 0)
|
|
return (error);
|
|
if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0)
|
|
DPRINTF(("error %d copying the message type\n", error));
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
sysctl_msqids(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
|
|
return (SYSCTL_OUT(req, msqids,
|
|
sizeof(struct msqid_kernel) * msginfo.msgmni));
|
|
}
|
|
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0,
|
|
"Maximum message size");
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0,
|
|
"Number of message queue identifiers");
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0,
|
|
"Maximum number of bytes in a queue");
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0,
|
|
"Maximum number of messages in the system");
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0,
|
|
"Size of a message segment");
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0,
|
|
"Number of message segments");
|
|
SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLTYPE_OPAQUE | CTLFLAG_RD,
|
|
NULL, 0, sysctl_msqids, "", "Message queue IDs");
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
int
|
|
freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap)
|
|
{
|
|
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
switch (uap->which) {
|
|
case 0:
|
|
return (freebsd7_freebsd32_msgctl(td,
|
|
(struct freebsd7_freebsd32_msgctl_args *)&uap->a2));
|
|
case 2:
|
|
return (freebsd32_msgsnd(td,
|
|
(struct freebsd32_msgsnd_args *)&uap->a2));
|
|
case 3:
|
|
return (freebsd32_msgrcv(td,
|
|
(struct freebsd32_msgrcv_args *)&uap->a2));
|
|
default:
|
|
return (msgsys(td, (struct msgsys_args *)uap));
|
|
}
|
|
#else
|
|
return (nosys(td, NULL));
|
|
#endif
|
|
}
|
|
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
int
|
|
freebsd7_freebsd32_msgctl(struct thread *td,
|
|
struct freebsd7_freebsd32_msgctl_args *uap)
|
|
{
|
|
struct msqid_ds msqbuf;
|
|
struct msqid_ds32_old msqbuf32;
|
|
int error;
|
|
|
|
if (uap->cmd == IPC_SET) {
|
|
error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
|
|
if (error)
|
|
return (error);
|
|
freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
|
|
PTRIN_CP(msqbuf32, msqbuf, msg_first);
|
|
PTRIN_CP(msqbuf32, msqbuf, msg_last);
|
|
CP(msqbuf32, msqbuf, msg_cbytes);
|
|
CP(msqbuf32, msqbuf, msg_qnum);
|
|
CP(msqbuf32, msqbuf, msg_qbytes);
|
|
CP(msqbuf32, msqbuf, msg_lspid);
|
|
CP(msqbuf32, msqbuf, msg_lrpid);
|
|
CP(msqbuf32, msqbuf, msg_stime);
|
|
CP(msqbuf32, msqbuf, msg_rtime);
|
|
CP(msqbuf32, msqbuf, msg_ctime);
|
|
}
|
|
error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
|
|
if (error)
|
|
return (error);
|
|
if (uap->cmd == IPC_STAT) {
|
|
bzero(&msqbuf32, sizeof(msqbuf32));
|
|
freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
|
|
PTROUT_CP(msqbuf, msqbuf32, msg_first);
|
|
PTROUT_CP(msqbuf, msqbuf32, msg_last);
|
|
CP(msqbuf, msqbuf32, msg_cbytes);
|
|
CP(msqbuf, msqbuf32, msg_qnum);
|
|
CP(msqbuf, msqbuf32, msg_qbytes);
|
|
CP(msqbuf, msqbuf32, msg_lspid);
|
|
CP(msqbuf, msqbuf32, msg_lrpid);
|
|
CP(msqbuf, msqbuf32, msg_stime);
|
|
CP(msqbuf, msqbuf32, msg_rtime);
|
|
CP(msqbuf, msqbuf32, msg_ctime);
|
|
error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
|
|
}
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
int
|
|
freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap)
|
|
{
|
|
struct msqid_ds msqbuf;
|
|
struct msqid_ds32 msqbuf32;
|
|
int error;
|
|
|
|
if (uap->cmd == IPC_SET) {
|
|
error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
|
|
if (error)
|
|
return (error);
|
|
freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
|
|
PTRIN_CP(msqbuf32, msqbuf, msg_first);
|
|
PTRIN_CP(msqbuf32, msqbuf, msg_last);
|
|
CP(msqbuf32, msqbuf, msg_cbytes);
|
|
CP(msqbuf32, msqbuf, msg_qnum);
|
|
CP(msqbuf32, msqbuf, msg_qbytes);
|
|
CP(msqbuf32, msqbuf, msg_lspid);
|
|
CP(msqbuf32, msqbuf, msg_lrpid);
|
|
CP(msqbuf32, msqbuf, msg_stime);
|
|
CP(msqbuf32, msqbuf, msg_rtime);
|
|
CP(msqbuf32, msqbuf, msg_ctime);
|
|
}
|
|
error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
|
|
if (error)
|
|
return (error);
|
|
if (uap->cmd == IPC_STAT) {
|
|
freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
|
|
PTROUT_CP(msqbuf, msqbuf32, msg_first);
|
|
PTROUT_CP(msqbuf, msqbuf32, msg_last);
|
|
CP(msqbuf, msqbuf32, msg_cbytes);
|
|
CP(msqbuf, msqbuf32, msg_qnum);
|
|
CP(msqbuf, msqbuf32, msg_qbytes);
|
|
CP(msqbuf, msqbuf32, msg_lspid);
|
|
CP(msqbuf, msqbuf32, msg_lrpid);
|
|
CP(msqbuf, msqbuf32, msg_stime);
|
|
CP(msqbuf, msqbuf32, msg_rtime);
|
|
CP(msqbuf, msqbuf32, msg_ctime);
|
|
error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap)
|
|
{
|
|
const void *msgp;
|
|
long mtype;
|
|
int32_t mtype32;
|
|
int error;
|
|
|
|
msgp = PTRIN(uap->msgp);
|
|
if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0)
|
|
return (error);
|
|
mtype = mtype32;
|
|
return (kern_msgsnd(td, uap->msqid,
|
|
(const char *)msgp + sizeof(mtype32),
|
|
uap->msgsz, uap->msgflg, mtype));
|
|
}
|
|
|
|
int
|
|
freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap)
|
|
{
|
|
void *msgp;
|
|
long mtype;
|
|
int32_t mtype32;
|
|
int error;
|
|
|
|
msgp = PTRIN(uap->msgp);
|
|
if ((error = kern_msgrcv(td, uap->msqid,
|
|
(char *)msgp + sizeof(mtype32), uap->msgsz,
|
|
uap->msgtyp, uap->msgflg, &mtype)) != 0)
|
|
return (error);
|
|
mtype32 = (int32_t)mtype;
|
|
return (copyout(&mtype32, msgp, sizeof(mtype32)));
|
|
}
|
|
#endif
|
|
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
|
|
/* XXX casting to (sy_call_t *) is bogus, as usual. */
|
|
static sy_call_t *msgcalls[] = {
|
|
(sy_call_t *)freebsd7_msgctl, (sy_call_t *)msgget,
|
|
(sy_call_t *)msgsnd, (sy_call_t *)msgrcv
|
|
};
|
|
|
|
/*
|
|
* Entry point for all MSG calls.
|
|
*/
|
|
int
|
|
msgsys(td, uap)
|
|
struct thread *td;
|
|
/* XXX actually varargs. */
|
|
struct msgsys_args /* {
|
|
int which;
|
|
int a2;
|
|
int a3;
|
|
int a4;
|
|
int a5;
|
|
int a6;
|
|
} */ *uap;
|
|
{
|
|
int error;
|
|
|
|
if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
|
|
return (ENOSYS);
|
|
if (uap->which < 0 ||
|
|
uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0]))
|
|
return (EINVAL);
|
|
error = (*msgcalls[uap->which])(td, &uap->a2);
|
|
return (error);
|
|
}
|
|
|
|
#ifndef CP
|
|
#define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0)
|
|
#endif
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct freebsd7_msgctl_args {
|
|
int msqid;
|
|
int cmd;
|
|
struct msqid_ds_old *buf;
|
|
};
|
|
#endif
|
|
int
|
|
freebsd7_msgctl(td, uap)
|
|
struct thread *td;
|
|
struct freebsd7_msgctl_args *uap;
|
|
{
|
|
struct msqid_ds_old msqold;
|
|
struct msqid_ds msqbuf;
|
|
int error;
|
|
|
|
DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd,
|
|
uap->buf));
|
|
if (uap->cmd == IPC_SET) {
|
|
error = copyin(uap->buf, &msqold, sizeof(msqold));
|
|
if (error)
|
|
return (error);
|
|
ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm);
|
|
CP(msqold, msqbuf, msg_first);
|
|
CP(msqold, msqbuf, msg_last);
|
|
CP(msqold, msqbuf, msg_cbytes);
|
|
CP(msqold, msqbuf, msg_qnum);
|
|
CP(msqold, msqbuf, msg_qbytes);
|
|
CP(msqold, msqbuf, msg_lspid);
|
|
CP(msqold, msqbuf, msg_lrpid);
|
|
CP(msqold, msqbuf, msg_stime);
|
|
CP(msqold, msqbuf, msg_rtime);
|
|
CP(msqold, msqbuf, msg_ctime);
|
|
}
|
|
error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
|
|
if (error)
|
|
return (error);
|
|
if (uap->cmd == IPC_STAT) {
|
|
bzero(&msqold, sizeof(msqold));
|
|
ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm);
|
|
CP(msqbuf, msqold, msg_first);
|
|
CP(msqbuf, msqold, msg_last);
|
|
CP(msqbuf, msqold, msg_cbytes);
|
|
CP(msqbuf, msqold, msg_qnum);
|
|
CP(msqbuf, msqold, msg_qbytes);
|
|
CP(msqbuf, msqold, msg_lspid);
|
|
CP(msqbuf, msqold, msg_lrpid);
|
|
CP(msqbuf, msqold, msg_stime);
|
|
CP(msqbuf, msqold, msg_rtime);
|
|
CP(msqbuf, msqold, msg_ctime);
|
|
error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
#undef CP
|
|
|
|
#endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
|
|
COMPAT_FREEBSD7 */
|