diff options
Diffstat (limited to 'sys/kern/sysv_msg.c')
| -rw-r--r-- | sys/kern/sysv_msg.c | 1592 |
1 files changed, 1592 insertions, 0 deletions
diff --git a/sys/kern/sysv_msg.c b/sys/kern/sysv_msg.c new file mode 100644 index 0000000..d58cb7e --- /dev/null +++ b/sys/kern/sysv_msg.c @@ -0,0 +1,1592 @@ +/*- + * 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_COMPAT(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_COMPAT(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 +sys_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 +sys_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; + } +#ifdef RACCT + 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; + } +#endif + 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; +#ifdef RACCT + size_t saved_msgsz; +#endif + + 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 + +#ifdef RACCT + 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); +#endif + + 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: +#ifdef RACCT + 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); + } +#endif +done2: + mtx_unlock(&msq_mtx); + return (error); +} + +int +sys_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 +sys_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 (sys_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 *)sys_msgget, + (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv +}; + +/* + * Entry point for all MSG calls. + */ +int +sys_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 */ |
