Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/portalfs/portal_vnops.c
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1 /*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software donated to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)portal_vnops.c 8.14 (Berkeley) 5/21/95 33 * 34 * $FreeBSD: releng/6.4/sys/fs/portalfs/portal_vnops.c 144208 2005-03-28 09:34:36Z jeff $ 35 */ 36 37 /* 38 * Portal Filesystem 39 */ 40 41 #include <sys/param.h> 42 #include <sys/fcntl.h> 43 #include <sys/file.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/mount.h> 49 #include <sys/mutex.h> 50 #include <sys/namei.h> 51 #include <sys/proc.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/stat.h> 55 #include <sys/sysproto.h> 56 #include <sys/systm.h> 57 #include <sys/un.h> 58 #include <sys/unpcb.h> 59 #include <sys/vnode.h> 60 61 #include <fs/portalfs/portal.h> 62 63 static int portal_fileid = PORTAL_ROOTFILEID+1; 64 65 static void portal_closefd(struct thread *td, int fd); 66 static int portal_connect(struct socket *so, struct socket *so2); 67 static vop_getattr_t portal_getattr; 68 static vop_lookup_t portal_lookup; 69 static vop_open_t portal_open; 70 static vop_readdir_t portal_readdir; 71 static vop_reclaim_t portal_reclaim; 72 static vop_setattr_t portal_setattr; 73 74 static void 75 portal_closefd(td, fd) 76 struct thread *td; 77 int fd; 78 { 79 int error; 80 struct close_args ua; 81 82 ua.fd = fd; 83 error = close(td, &ua); 84 /* 85 * We should never get an error, and there isn't anything 86 * we could do if we got one, so just print a message. 87 */ 88 if (error) 89 printf("portal_closefd: error = %d\n", error); 90 } 91 92 /* 93 * vp is the current namei directory 94 * cnp is the name to locate in that directory... 95 */ 96 static int 97 portal_lookup(ap) 98 struct vop_lookup_args /* { 99 struct vnode * a_dvp; 100 struct vnode ** a_vpp; 101 struct componentname * a_cnp; 102 } */ *ap; 103 { 104 struct componentname *cnp = ap->a_cnp; 105 struct vnode **vpp = ap->a_vpp; 106 struct vnode *dvp = ap->a_dvp; 107 char *pname = cnp->cn_nameptr; 108 struct thread *td = cnp->cn_thread; 109 struct portalnode *pt; 110 int error; 111 struct vnode *fvp = 0; 112 char *path; 113 int size; 114 115 *vpp = NULLVP; 116 117 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 118 return (EROFS); 119 120 if (cnp->cn_namelen == 1 && *pname == '.') { 121 *vpp = dvp; 122 VREF(dvp); 123 return (0); 124 } 125 KASSERT((cnp->cn_flags & ISDOTDOT) == 0, 126 ("portal_lookup: Can not handle dotdot lookups.")); 127 128 /* 129 * Do the MALLOC before the getnewvnode since doing so afterward 130 * might cause a bogus v_data pointer to get dereferenced 131 * elsewhere if MALLOC should block. 132 */ 133 MALLOC(pt, struct portalnode *, sizeof(struct portalnode), 134 M_TEMP, M_WAITOK); 135 136 error = getnewvnode("portal", dvp->v_mount, &portal_vnodeops, &fvp); 137 if (error) { 138 FREE(pt, M_TEMP); 139 goto bad; 140 } 141 fvp->v_type = VREG; 142 fvp->v_data = pt; 143 /* 144 * Save all of the remaining pathname and 145 * advance the namei next pointer to the end 146 * of the string. 147 */ 148 for (size = 0, path = pname; *path; path++) 149 size++; 150 cnp->cn_consume = size - cnp->cn_namelen; 151 152 pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK); 153 pt->pt_size = size+1; 154 bcopy(pname, pt->pt_arg, pt->pt_size); 155 pt->pt_fileid = portal_fileid++; 156 157 *vpp = fvp; 158 vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, td); 159 return (0); 160 161 bad:; 162 if (fvp) 163 vrele(fvp); 164 return (error); 165 } 166 167 static int 168 portal_connect(so, so2) 169 struct socket *so; 170 struct socket *so2; 171 { 172 /* from unp_connect, bypassing the namei stuff... */ 173 struct socket *so3; 174 struct unpcb *unp2; 175 struct unpcb *unp3; 176 177 if (so2 == 0) 178 return (ECONNREFUSED); 179 180 if (so->so_type != so2->so_type) 181 return (EPROTOTYPE); 182 183 if ((so2->so_options & SO_ACCEPTCONN) == 0) 184 return (ECONNREFUSED); 185 186 if ((so3 = sonewconn(so2, 0)) == 0) 187 return (ECONNREFUSED); 188 189 unp2 = sotounpcb(so2); 190 unp3 = sotounpcb(so3); 191 if (unp2->unp_addr) 192 unp3->unp_addr = (struct sockaddr_un *) 193 sodupsockaddr((struct sockaddr *)unp2->unp_addr, 194 M_NOWAIT); 195 so2 = so3; 196 197 return (uipc_connect2(so, so2)); 198 } 199 200 static int 201 portal_open(ap) 202 struct vop_open_args /* { 203 struct vnode *a_vp; 204 int a_mode; 205 struct ucred *a_cred; 206 struct thread *a_td; 207 } */ *ap; 208 { 209 struct socket *so = 0; 210 struct portalnode *pt; 211 struct thread *td = ap->a_td; 212 struct vnode *vp = ap->a_vp; 213 struct uio auio; 214 struct iovec aiov[2]; 215 int res; 216 struct mbuf *cm = 0; 217 struct cmsghdr *cmsg; 218 int newfds; 219 int *ip; 220 int fd; 221 int error; 222 int len; 223 struct portalmount *fmp; 224 struct file *fp; 225 struct portal_cred pcred; 226 227 /* 228 * Nothing to do when opening the root node. 229 */ 230 if (vp->v_vflag & VV_ROOT) 231 return (0); 232 233 /* 234 * Can't be opened unless the caller is set up 235 * to deal with the side effects. Check for this 236 * by testing whether the p_dupfd has been set. 237 */ 238 if (td->td_dupfd >= 0) 239 return (ENODEV); 240 241 pt = VTOPORTAL(vp); 242 fmp = VFSTOPORTAL(vp->v_mount); 243 244 /* 245 * Create a new socket. 246 */ 247 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_td->td_ucred, 248 ap->a_td); 249 if (error) 250 goto bad; 251 252 /* 253 * Reserve some buffer space 254 */ 255 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */ 256 error = soreserve(so, res, res); 257 if (error) 258 goto bad; 259 260 /* 261 * Kick off connection 262 */ 263 error = portal_connect(so, fmp->pm_server->f_data); 264 if (error) 265 goto bad; 266 267 /* 268 * Wait for connection to complete 269 */ 270 /* 271 * XXX: Since the mount point is holding a reference on the 272 * underlying server socket, it is not easy to find out whether 273 * the server process is still running. To handle this problem 274 * we loop waiting for the new socket to be connected (something 275 * which will only happen if the server is still running) or for 276 * the reference count on the server socket to drop to 1, which 277 * will happen if the server dies. Sleep for 5 second intervals 278 * and keep polling the reference count. XXX. 279 */ 280 /* XXXRW: Locking? */ 281 SOCK_LOCK(so); 282 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 283 if (fmp->pm_server->f_count == 1) { 284 SOCK_UNLOCK(so); 285 error = ECONNREFUSED; 286 goto bad; 287 } 288 (void) msleep((caddr_t) &so->so_timeo, SOCK_MTX(so), PSOCK, 289 "portalcon", 5 * hz); 290 } 291 SOCK_UNLOCK(so); 292 293 if (so->so_error) { 294 error = so->so_error; 295 goto bad; 296 } 297 298 /* 299 * Set miscellaneous flags 300 */ 301 SOCKBUF_LOCK(&so->so_rcv); 302 so->so_rcv.sb_timeo = 0; 303 so->so_rcv.sb_flags |= SB_NOINTR; 304 SOCKBUF_UNLOCK(&so->so_rcv); 305 SOCKBUF_LOCK(&so->so_snd); 306 so->so_snd.sb_timeo = 0; 307 so->so_snd.sb_flags |= SB_NOINTR; 308 SOCKBUF_UNLOCK(&so->so_snd); 309 310 311 pcred.pcr_flag = ap->a_mode; 312 pcred.pcr_uid = ap->a_cred->cr_uid; 313 pcred.pcr_ngroups = ap->a_cred->cr_ngroups; 314 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t)); 315 aiov[0].iov_base = (caddr_t) &pcred; 316 aiov[0].iov_len = sizeof(pcred); 317 aiov[1].iov_base = pt->pt_arg; 318 aiov[1].iov_len = pt->pt_size; 319 auio.uio_iov = aiov; 320 auio.uio_iovcnt = 2; 321 auio.uio_rw = UIO_WRITE; 322 auio.uio_segflg = UIO_SYSSPACE; 323 auio.uio_td = td; 324 auio.uio_offset = 0; 325 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len; 326 327 error = sosend(so, (struct sockaddr *) 0, &auio, 328 (struct mbuf *) 0, (struct mbuf *) 0, 0 , td); 329 if (error) 330 goto bad; 331 332 len = auio.uio_resid = sizeof(int); 333 do { 334 struct mbuf *m = 0; 335 int flags = MSG_WAITALL; 336 error = soreceive(so, (struct sockaddr **) 0, &auio, 337 &m, &cm, &flags); 338 if (error) 339 goto bad; 340 341 /* 342 * Grab an error code from the mbuf. 343 */ 344 if (m) { 345 m = m_pullup(m, sizeof(int)); /* Needed? */ 346 if (m) { 347 error = *(mtod(m, int *)); 348 m_freem(m); 349 } else { 350 error = EINVAL; 351 } 352 } else { 353 if (cm == 0) { 354 error = ECONNRESET; /* XXX */ 355 #ifdef notdef 356 break; 357 #endif 358 } 359 } 360 } while (cm == 0 && auio.uio_resid == len && !error); 361 362 if (cm == 0) 363 goto bad; 364 365 if (auio.uio_resid) { 366 error = 0; 367 #ifdef notdef 368 error = EMSGSIZE; 369 goto bad; 370 #endif 371 } 372 373 /* 374 * XXX: Break apart the control message, and retrieve the 375 * received file descriptor. Note that more than one descriptor 376 * may have been received, or that the rights chain may have more 377 * than a single mbuf in it. What to do? 378 */ 379 cmsg = mtod(cm, struct cmsghdr *); 380 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int); 381 if (newfds == 0) { 382 error = ECONNREFUSED; 383 goto bad; 384 } 385 /* 386 * At this point the rights message consists of a control message 387 * header, followed by a data region containing a vector of 388 * integer file descriptors. The fds were allocated by the action 389 * of receiving the control message. 390 */ 391 ip = (int *) (cmsg + 1); 392 fd = *ip++; 393 if (newfds > 1) { 394 /* 395 * Close extra fds. 396 */ 397 int i; 398 printf("portal_open: %d extra fds\n", newfds - 1); 399 for (i = 1; i < newfds; i++) { 400 portal_closefd(td, *ip); 401 ip++; 402 } 403 } 404 405 /* 406 * Check that the mode the file is being opened for is a subset 407 * of the mode of the existing descriptor. 408 */ 409 if ((error = fget(td, fd, &fp)) != 0) 410 goto bad; 411 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) { 412 fdrop(fp, td); 413 portal_closefd(td, fd); 414 error = EACCES; 415 goto bad; 416 } 417 fdrop(fp, td); 418 419 /* 420 * Save the dup fd in the proc structure then return the 421 * special error code (ENXIO) which causes magic things to 422 * happen in vn_open. The whole concept is, well, hmmm. 423 */ 424 td->td_dupfd = fd; 425 error = ENXIO; 426 427 bad:; 428 /* 429 * And discard the control message. 430 */ 431 if (cm) { 432 m_freem(cm); 433 } 434 435 if (so) { 436 soshutdown(so, 2); 437 soclose(so); 438 } 439 return (error); 440 } 441 442 static int 443 portal_getattr(ap) 444 struct vop_getattr_args /* { 445 struct vnode *a_vp; 446 struct vattr *a_vap; 447 struct ucred *a_cred; 448 struct thread *a_td; 449 } */ *ap; 450 { 451 struct vnode *vp = ap->a_vp; 452 struct vattr *vap = ap->a_vap; 453 454 bzero(vap, sizeof(*vap)); 455 vattr_null(vap); 456 vap->va_uid = 0; 457 vap->va_gid = 0; 458 vap->va_size = DEV_BSIZE; 459 vap->va_blocksize = DEV_BSIZE; 460 nanotime(&vap->va_atime); 461 vap->va_mtime = vap->va_atime; 462 vap->va_ctime = vap->va_mtime; 463 vap->va_gen = 0; 464 vap->va_flags = 0; 465 vap->va_rdev = 0; 466 /* vap->va_qbytes = 0; */ 467 vap->va_bytes = 0; 468 /* vap->va_qsize = 0; */ 469 if (vp->v_vflag & VV_ROOT) { 470 vap->va_type = VDIR; 471 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR| 472 S_IRGRP|S_IWGRP|S_IXGRP| 473 S_IROTH|S_IWOTH|S_IXOTH; 474 vap->va_nlink = 2; 475 vap->va_fileid = 2; 476 } else { 477 vap->va_type = VREG; 478 vap->va_mode = S_IRUSR|S_IWUSR| 479 S_IRGRP|S_IWGRP| 480 S_IROTH|S_IWOTH; 481 vap->va_nlink = 1; 482 vap->va_fileid = VTOPORTAL(vp)->pt_fileid; 483 } 484 return (0); 485 } 486 487 static int 488 portal_setattr(ap) 489 struct vop_setattr_args /* { 490 struct vnode *a_vp; 491 struct vattr *a_vap; 492 struct ucred *a_cred; 493 struct thread *a_td; 494 } */ *ap; 495 { 496 497 /* 498 * Can't mess with the root vnode 499 */ 500 if (ap->a_vp->v_vflag & VV_ROOT) 501 return (EACCES); 502 503 if (ap->a_vap->va_flags != VNOVAL) 504 return (EOPNOTSUPP); 505 506 return (0); 507 } 508 509 /* 510 * Fake readdir, just return empty directory. 511 * It is hard to deal with '.' and '..' so don't bother. 512 */ 513 static int 514 portal_readdir(ap) 515 struct vop_readdir_args /* { 516 struct vnode *a_vp; 517 struct uio *a_uio; 518 struct ucred *a_cred; 519 int *a_eofflag; 520 u_long *a_cookies; 521 int a_ncookies; 522 } */ *ap; 523 { 524 525 /* 526 * We don't allow exporting portal mounts, and currently local 527 * requests do not need cookies. 528 */ 529 if (ap->a_ncookies) 530 panic("portal_readdir: not hungry"); 531 532 return (0); 533 } 534 535 static int 536 portal_reclaim(ap) 537 struct vop_reclaim_args /* { 538 struct vnode *a_vp; 539 } */ *ap; 540 { 541 struct portalnode *pt = VTOPORTAL(ap->a_vp); 542 543 if (pt->pt_arg) { 544 free((caddr_t) pt->pt_arg, M_TEMP); 545 pt->pt_arg = 0; 546 } 547 FREE(ap->a_vp->v_data, M_TEMP); 548 ap->a_vp->v_data = 0; 549 550 return (0); 551 } 552 553 struct vop_vector portal_vnodeops = { 554 .vop_default = &default_vnodeops, 555 556 .vop_access = VOP_NULL, 557 .vop_getattr = portal_getattr, 558 .vop_lookup = portal_lookup, 559 .vop_open = portal_open, 560 .vop_pathconf = vop_stdpathconf, 561 .vop_readdir = portal_readdir, 562 .vop_reclaim = portal_reclaim, 563 .vop_setattr = portal_setattr, 564 };
Cache object: 355bab24f924892ca8ff85b88e9d9a46
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