linux_ipc.c revision 1.39.2.1
1 /* $NetBSD: linux_ipc.c,v 1.39.2.1 2007/07/15 13:27:10 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: linux_ipc.c,v 1.39.2.1 2007/07/15 13:27:10 ad Exp $"); 41 42 #if defined(_KERNEL_OPT) 43 #include "opt_sysv.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/shm.h> 48 #include <sys/sem.h> 49 #include <sys/msg.h> 50 #include <sys/proc.h> 51 #include <sys/systm.h> 52 53 #include <sys/mount.h> 54 #include <sys/syscallargs.h> 55 56 #include <compat/linux/common/linux_types.h> 57 #include <compat/linux/common/linux_signal.h> 58 #include <compat/linux/common/linux_util.h> 59 #include <compat/linux/common/linux_ipc.h> 60 #include <compat/linux/common/linux_msg.h> 61 #include <compat/linux/common/linux_shm.h> 62 #include <compat/linux/common/linux_sem.h> 63 64 #include <compat/linux/linux_syscallargs.h> 65 #include <compat/linux/linux_syscall.h> 66 67 #include <compat/linux/common/linux_ipccall.h> 68 69 /* 70 * Note: Not all linux architechtures have explicit versions 71 * of the SYSV* syscalls. On the ones that don't 72 * we pretend that they are defined anyway. *_args and 73 * prototypes are defined in individual headers; 74 * syscalls.master lists those syscalls as NOARGS. 75 * 76 * The functions in multiarch are the ones that just need 77 * the arguments shuffled around and then use the 78 * normal NetBSD syscall. 79 * 80 * Function in multiarch: 81 * linux_sys_ipc : linux_ipccall.c 82 * liunx_semop : linux_ipccall.c 83 * linux_semget : linux_ipccall.c 84 * linux_msgsnd : linux_ipccall.c 85 * linux_msgrcv : linux_ipccall.c 86 * linux_msgget : linux_ipccall.c 87 * linux_shmdt : linux_ipccall.c 88 * linux_shmget : linux_ipccall.c 89 */ 90 91 #if defined (SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG) 92 /* 93 * Convert between Linux and NetBSD ipc_perm structures. Only the 94 * order of the fields is different. 95 */ 96 void 97 linux_to_bsd_ipc_perm(lpp, bpp) 98 struct linux_ipc_perm *lpp; 99 struct ipc_perm *bpp; 100 { 101 102 bpp->_key = lpp->l_key; 103 bpp->uid = lpp->l_uid; 104 bpp->gid = lpp->l_gid; 105 bpp->cuid = lpp->l_cuid; 106 bpp->cgid = lpp->l_cgid; 107 bpp->mode = lpp->l_mode; 108 bpp->_seq = lpp->l_seq; 109 } 110 111 void 112 linux_to_bsd_ipc64_perm(lpp, bpp) 113 struct linux_ipc64_perm *lpp; 114 struct ipc_perm *bpp; 115 { 116 bpp->_key = lpp->l_key; 117 bpp->uid = lpp->l_uid; 118 bpp->gid = lpp->l_gid; 119 bpp->cuid = lpp->l_cuid; 120 bpp->cgid = lpp->l_cgid; 121 bpp->mode = lpp->l_mode; 122 bpp->_seq = lpp->l_seq; 123 } 124 125 void 126 bsd_to_linux_ipc_perm(bpp, lpp) 127 struct ipc_perm *bpp; 128 struct linux_ipc_perm *lpp; 129 { 130 131 lpp->l_key = bpp->_key; 132 lpp->l_uid = bpp->uid; 133 lpp->l_gid = bpp->gid; 134 lpp->l_cuid = bpp->cuid; 135 lpp->l_cgid = bpp->cgid; 136 lpp->l_mode = bpp->mode; 137 lpp->l_seq = bpp->_seq; 138 } 139 140 void 141 bsd_to_linux_ipc64_perm(bpp, lpp) 142 struct ipc_perm *bpp; 143 struct linux_ipc64_perm *lpp; 144 { 145 lpp->l_key = bpp->_key; 146 lpp->l_uid = bpp->uid; 147 lpp->l_gid = bpp->gid; 148 lpp->l_cuid = bpp->cuid; 149 lpp->l_cgid = bpp->cgid; 150 lpp->l_mode = bpp->mode; 151 lpp->l_seq = bpp->_seq; 152 } 153 154 #endif 155 156 #ifdef SYSVSEM 157 /* 158 * Semaphore operations. Most constants and structures are the same on 159 * both systems. Only semctl() needs some extra work. 160 */ 161 162 /* 163 * Convert between Linux and NetBSD semid_ds structures. 164 */ 165 void 166 bsd_to_linux_semid_ds(bs, ls) 167 struct semid_ds *bs; 168 struct linux_semid_ds *ls; 169 { 170 171 bsd_to_linux_ipc_perm(&bs->sem_perm, &ls->l_sem_perm); 172 ls->l_sem_otime = bs->sem_otime; 173 ls->l_sem_ctime = bs->sem_ctime; 174 ls->l_sem_nsems = bs->sem_nsems; 175 ls->l_sem_base = bs->_sem_base; 176 } 177 178 void 179 linux_to_bsd_semid_ds(ls, bs) 180 struct linux_semid_ds *ls; 181 struct semid_ds *bs; 182 { 183 184 linux_to_bsd_ipc_perm(&ls->l_sem_perm, &bs->sem_perm); 185 bs->sem_otime = ls->l_sem_otime; 186 bs->sem_ctime = ls->l_sem_ctime; 187 bs->sem_nsems = ls->l_sem_nsems; 188 bs->_sem_base = ls->l_sem_base; 189 } 190 191 /* 192 * Most of this can be handled by directly passing the arguments on; we 193 * just need to frob the `cmd' and convert the semid_ds and semun. 194 */ 195 int 196 linux_sys_semctl(l, v, retval) 197 struct lwp *l; 198 void *v; 199 register_t *retval; 200 { 201 struct linux_sys_semctl_args /* { 202 syscallarg(int) semid; 203 syscallarg(int) semnum; 204 syscallarg(int) cmd; 205 syscallarg(union linux_semun) arg; 206 } */ *uap = v; 207 struct semid_ds sembuf; 208 struct linux_semid_ds lsembuf; 209 union __semun semun; 210 int cmd, error; 211 void *pass_arg = NULL; 212 213 cmd = SCARG(uap, cmd); 214 215 switch (cmd) { 216 case LINUX_IPC_SET: 217 pass_arg = &sembuf; 218 cmd = IPC_SET; 219 break; 220 221 case LINUX_IPC_STAT: 222 pass_arg = &sembuf; 223 cmd = IPC_STAT; 224 break; 225 226 case LINUX_IPC_RMID: 227 cmd = IPC_RMID; 228 break; 229 230 case LINUX_GETVAL: 231 cmd = GETVAL; 232 break; 233 234 case LINUX_GETPID: 235 cmd = GETPID; 236 break; 237 238 case LINUX_GETNCNT: 239 cmd = GETNCNT; 240 break; 241 242 case LINUX_GETZCNT: 243 cmd = GETZCNT; 244 break; 245 246 case LINUX_GETALL: 247 pass_arg = &semun; 248 semun.array = SCARG(uap, arg).l_array; 249 cmd = GETALL; 250 break; 251 252 case LINUX_SETVAL: 253 pass_arg = &semun; 254 semun.val = SCARG(uap, arg).l_val; 255 cmd = SETVAL; 256 break; 257 258 case LINUX_SETALL: 259 pass_arg = &semun; 260 semun.array = SCARG(uap, arg).l_array; 261 cmd = SETALL; 262 break; 263 264 default: 265 return (EINVAL); 266 } 267 268 if (cmd == IPC_SET) { 269 error = copyin(SCARG(uap, arg).l_buf, &lsembuf, 270 sizeof(lsembuf)); 271 if (error) 272 return (error); 273 linux_to_bsd_semid_ds(&lsembuf, &sembuf); 274 } 275 276 error = semctl1(l, SCARG(uap, semid), SCARG(uap, semnum), cmd, 277 pass_arg, retval); 278 279 if (error == 0 && cmd == IPC_STAT) { 280 bsd_to_linux_semid_ds(&sembuf, &lsembuf); 281 error = copyout(&lsembuf, SCARG(uap, arg).l_buf, 282 sizeof(lsembuf)); 283 } 284 285 return (error); 286 } 287 #endif /* SYSVSEM */ 288 289 #ifdef SYSVMSG 290 291 void 292 linux_to_bsd_msqid_ds(lmp, bmp) 293 struct linux_msqid_ds *lmp; 294 struct msqid_ds *bmp; 295 { 296 297 linux_to_bsd_ipc_perm(&lmp->l_msg_perm, &bmp->msg_perm); 298 bmp->_msg_first = lmp->l_msg_first; 299 bmp->_msg_last = lmp->l_msg_last; 300 bmp->_msg_cbytes = lmp->l_msg_cbytes; 301 bmp->msg_qnum = lmp->l_msg_qnum; 302 bmp->msg_qbytes = lmp->l_msg_qbytes; 303 bmp->msg_lspid = lmp->l_msg_lspid; 304 bmp->msg_lrpid = lmp->l_msg_lrpid; 305 bmp->msg_stime = lmp->l_msg_stime; 306 bmp->msg_rtime = lmp->l_msg_rtime; 307 bmp->msg_ctime = lmp->l_msg_ctime; 308 } 309 310 void 311 bsd_to_linux_msqid_ds(bmp, lmp) 312 struct msqid_ds *bmp; 313 struct linux_msqid_ds *lmp; 314 { 315 316 bsd_to_linux_ipc_perm(&bmp->msg_perm, &lmp->l_msg_perm); 317 lmp->l_msg_first = bmp->_msg_first; 318 lmp->l_msg_last = bmp->_msg_last; 319 lmp->l_msg_cbytes = bmp->_msg_cbytes; 320 lmp->l_msg_qnum = bmp->msg_qnum; 321 lmp->l_msg_qbytes = bmp->msg_qbytes; 322 lmp->l_msg_lspid = bmp->msg_lspid; 323 lmp->l_msg_lrpid = bmp->msg_lrpid; 324 lmp->l_msg_stime = bmp->msg_stime; 325 lmp->l_msg_rtime = bmp->msg_rtime; 326 lmp->l_msg_ctime = bmp->msg_ctime; 327 } 328 329 int 330 linux_sys_msgctl(l, v, retval) 331 struct lwp *l; 332 void *v; 333 register_t *retval; 334 { 335 struct linux_sys_msgctl_args /* { 336 syscallarg(int) msqid; 337 syscallarg(int) cmd; 338 syscallarg(struct linux_msqid_ds *) buf; 339 } */ *uap = v; 340 struct msqid_ds bm; 341 struct linux_msqid_ds lm; 342 int error; 343 344 switch (SCARG(uap, cmd)) { 345 case LINUX_IPC_STAT: 346 error = msgctl1(l, SCARG(uap, msqid), IPC_STAT, &bm); 347 if (error == 0) { 348 bsd_to_linux_msqid_ds(&bm, &lm); 349 error = copyout(&lm, SCARG(uap, buf), sizeof lm); 350 } 351 return error; 352 case LINUX_IPC_SET: 353 if ((error = copyin(SCARG(uap, buf), &lm, sizeof lm))) 354 return error; 355 linux_to_bsd_msqid_ds(&lm, &bm); 356 return msgctl1(l, SCARG(uap, msqid), IPC_SET, &bm); 357 case LINUX_IPC_RMID: 358 return msgctl1(l, SCARG(uap, msqid), IPC_RMID, NULL); 359 break; 360 default: 361 return EINVAL; 362 } 363 } 364 #endif /* SYSVMSG */ 365 366 #ifdef SYSVSHM 367 /* 368 * shmget(2). Just make sure the Linux-compatible shmat() semantics 369 * is enabled for the segment, so that shmat() succeeds even when 370 * the segment would be removed. 371 */ 372 int 373 linux_sys_shmget(l, v, retval) 374 struct lwp *l; 375 void *v; 376 register_t *retval; 377 { 378 struct sys_shmget_args /* { 379 syscallarg(key_t) key; 380 syscallarg(size_t) size; 381 syscallarg(int) shmflg; 382 } */ *uap = v; 383 384 SCARG(uap, shmflg) |= _SHM_RMLINGER; 385 return sys_shmget(l, uap, retval); 386 } 387 388 /* 389 * shmat(2). Very straightforward, except that Linux passes a pointer 390 * in which the return value is to be passed. This is subsequently 391 * handled by libc, apparently. 392 */ 393 #ifndef __amd64__ 394 int 395 linux_sys_shmat(l, v, retval) 396 struct lwp *l; 397 void *v; 398 register_t *retval; 399 { 400 struct linux_sys_shmat_args /* { 401 syscallarg(int) shmid; 402 syscallarg(void *) shmaddr; 403 syscallarg(int) shmflg; 404 syscallarg(u_long *) raddr; 405 } */ *uap = v; 406 int error; 407 408 if ((error = sys_shmat(l, uap, retval))) 409 return error; 410 411 #ifndef __amd64__ 412 if ((error = copyout(&retval[0], (void *) SCARG(uap, raddr), 413 sizeof retval[0]))) 414 return error; 415 416 retval[0] = 0; 417 #endif 418 return 0; 419 } 420 #endif /* __amd64__ */ 421 422 /* 423 * Convert between Linux and NetBSD shmid_ds structures. 424 * The order of the fields is once again the difference, and 425 * we also need a place to store the internal data pointer 426 * in, which is unfortunately stored in this structure. 427 * 428 * We abuse a Linux internal field for that. 429 */ 430 void 431 linux_to_bsd_shmid_ds(lsp, bsp) 432 struct linux_shmid_ds *lsp; 433 struct shmid_ds *bsp; 434 { 435 436 linux_to_bsd_ipc_perm(&lsp->l_shm_perm, &bsp->shm_perm); 437 bsp->shm_segsz = lsp->l_shm_segsz; 438 bsp->shm_lpid = lsp->l_shm_lpid; 439 bsp->shm_cpid = lsp->l_shm_cpid; 440 bsp->shm_nattch = lsp->l_shm_nattch; 441 bsp->shm_atime = lsp->l_shm_atime; 442 bsp->shm_dtime = lsp->l_shm_dtime; 443 bsp->shm_ctime = lsp->l_shm_ctime; 444 bsp->_shm_internal = lsp->l_private2; /* XXX Oh well. */ 445 } 446 447 void 448 linux_to_bsd_shmid64_ds(lsp, bsp) 449 struct linux_shmid64_ds *lsp; 450 struct shmid_ds *bsp; 451 { 452 453 linux_to_bsd_ipc64_perm(&lsp->l_shm_perm, &bsp->shm_perm); 454 bsp->shm_segsz = lsp->l_shm_segsz; 455 bsp->shm_lpid = lsp->l_shm_lpid; 456 bsp->shm_cpid = lsp->l_shm_cpid; 457 bsp->shm_nattch = lsp->l_shm_nattch; 458 bsp->shm_atime = lsp->l_shm_atime; 459 bsp->shm_dtime = lsp->l_shm_dtime; 460 bsp->shm_ctime = lsp->l_shm_ctime; 461 bsp->_shm_internal = (void*)lsp->l___unused5; /* XXX Oh well. */ 462 } 463 464 void 465 bsd_to_linux_shmid_ds(bsp, lsp) 466 struct shmid_ds *bsp; 467 struct linux_shmid_ds *lsp; 468 { 469 470 bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->l_shm_perm); 471 lsp->l_shm_segsz = bsp->shm_segsz; 472 lsp->l_shm_lpid = bsp->shm_lpid; 473 lsp->l_shm_cpid = bsp->shm_cpid; 474 lsp->l_shm_nattch = bsp->shm_nattch; 475 lsp->l_shm_atime = bsp->shm_atime; 476 lsp->l_shm_dtime = bsp->shm_dtime; 477 lsp->l_shm_ctime = bsp->shm_ctime; 478 lsp->l_private2 = bsp->_shm_internal; /* XXX */ 479 } 480 481 void 482 bsd_to_linux_shmid64_ds(bsp, lsp) 483 struct shmid_ds *bsp; 484 struct linux_shmid64_ds *lsp; 485 { 486 bsd_to_linux_ipc64_perm(&bsp->shm_perm, &lsp->l_shm_perm); 487 lsp->l_shm_segsz = bsp->shm_segsz; 488 lsp->l_shm_lpid = bsp->shm_lpid; 489 lsp->l_shm_cpid = bsp->shm_cpid; 490 lsp->l_shm_nattch = bsp->shm_nattch; 491 lsp->l_shm_atime = bsp->shm_atime; 492 lsp->l_shm_dtime = bsp->shm_dtime; 493 lsp->l_shm_ctime = bsp->shm_ctime; 494 lsp->l___unused5 = (u_long)bsp->_shm_internal; /* XXX */ 495 } 496 497 /* 498 * shmctl.SHM_LOCK and SHM_UNLOCK are passed on, but currently not implemented 499 * by NetBSD itself. 500 * 501 * The usual structure conversion and massaging is done. 502 */ 503 int 504 linux_sys_shmctl(l, v, retval) 505 struct lwp *l; 506 void *v; 507 register_t *retval; 508 { 509 struct linux_sys_shmctl_args /* { 510 syscallarg(int) shmid; 511 syscallarg(int) cmd; 512 syscallarg(struct linux_shmid_ds *) buf; 513 } */ *uap = v; 514 struct shmid_ds bs; 515 struct linux_shmid_ds ls; 516 struct linux_shmid64_ds ls64; 517 struct linux_shminfo64 lsi64; 518 struct linux_shm_info lsi; 519 int error, i, cmd; 520 521 cmd = SCARG(uap, cmd); 522 switch (cmd) { 523 case LINUX_IPC_STAT: 524 case LINUX_SHM_STAT: 525 error = shmctl1(l, SCARG(uap, shmid), IPC_STAT, &bs); 526 if (error != 0) 527 return error; 528 bsd_to_linux_shmid_ds(&bs, &ls); 529 if (cmd == LINUX_SHM_STAT) 530 retval[0] = IXSEQ_TO_IPCID(bs.shm_perm._key, 531 bs.shm_perm); 532 return copyout(&ls, SCARG(uap, buf), sizeof ls); 533 534 case LINUX_IPC_STAT | LINUX_IPC_64: 535 case LINUX_SHM_STAT | LINUX_IPC_64: 536 error = shmctl1(l, SCARG(uap, shmid), IPC_STAT, &bs); 537 if (error != 0) 538 return error; 539 bsd_to_linux_shmid64_ds(&bs, &ls64); 540 if (cmd == (LINUX_SHM_STAT | LINUX_IPC_64)) { 541 retval[0] = IXSEQ_TO_IPCID(bs.shm_perm._key, 542 bs.shm_perm); 543 } 544 return copyout(&ls64, SCARG(uap, buf), sizeof ls64); 545 546 case LINUX_IPC_SET: 547 if ((error = copyin(SCARG(uap, buf), &ls, sizeof ls))) 548 return error; 549 linux_to_bsd_shmid_ds(&ls, &bs); 550 return shmctl1(l, SCARG(uap, shmid), IPC_SET, &bs); 551 552 case LINUX_IPC_RMID: 553 return shmctl1(l, SCARG(uap, shmid), IPC_RMID, NULL); 554 555 case LINUX_SHM_LOCK: 556 return shmctl1(l, SCARG(uap, shmid), SHM_LOCK, NULL); 557 558 case LINUX_SHM_UNLOCK: 559 return shmctl1(l, SCARG(uap, shmid), SHM_UNLOCK, NULL); 560 561 case LINUX_IPC_INFO: 562 memset(&lsi64, 0, sizeof lsi64); 563 lsi64.l_shmmax = shminfo.shmmax; 564 lsi64.l_shmmin = shminfo.shmmin; 565 lsi64.l_shmmni = shminfo.shmmni; 566 lsi64.l_shmseg = shminfo.shmseg; 567 lsi64.l_shmall = shminfo.shmall; 568 return copyout(&lsi64, SCARG(uap, buf), sizeof lsi64); 569 570 case LINUX_SHM_INFO: 571 (void)memset(&lsi, 0, sizeof lsi); 572 lsi.l_used_ids = shm_nused; 573 for (i = 0; i < shminfo.shmmni; i++) 574 if (shmsegs[i].shm_perm.mode & SHMSEG_ALLOCATED) 575 lsi.l_shm_tot += shmsegs[i].shm_segsz; 576 lsi.l_shm_rss = 0; 577 lsi.l_shm_swp = 0; 578 lsi.l_swap_attempts = 0; 579 lsi.l_swap_successes = 0; 580 return copyout(&lsi, SCARG(uap, buf), sizeof lsi); 581 582 default: 583 #ifdef DEBUG 584 printf("linux_sys_shmctl cmd %d\n", SCARG(uap, cmd)); 585 #endif 586 return EINVAL; 587 } 588 } 589 #endif /* SYSVSHM */ 590
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