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
Version:
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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 * $FreeBSD$ 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/syscallsubr.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 81 error = kern_close(td, fd); 82 /* 83 * We should never get an error, and there isn't anything 84 * we could do if we got one, so just print a message. 85 */ 86 if (error) 87 printf("portal_closefd: error = %d\n", error); 88 } 89 90 /* 91 * vp is the current namei directory 92 * cnp is the name to locate in that directory... 93 */ 94 static int 95 portal_lookup(ap) 96 struct vop_lookup_args /* { 97 struct vnode * a_dvp; 98 struct vnode ** a_vpp; 99 struct componentname * a_cnp; 100 } */ *ap; 101 { 102 struct componentname *cnp = ap->a_cnp; 103 struct vnode **vpp = ap->a_vpp; 104 struct vnode *dvp = ap->a_dvp; 105 char *pname = cnp->cn_nameptr; 106 struct thread *td = cnp->cn_thread; 107 struct portalnode *pt; 108 int error; 109 struct vnode *fvp = 0; 110 char *path; 111 int size; 112 113 *vpp = NULLVP; 114 115 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 116 return (EROFS); 117 118 if (cnp->cn_namelen == 1 && *pname == '.') { 119 *vpp = dvp; 120 VREF(dvp); 121 return (0); 122 } 123 KASSERT((cnp->cn_flags & ISDOTDOT) == 0, 124 ("portal_lookup: Can not handle dotdot lookups.")); 125 126 /* 127 * Do the MALLOC before the getnewvnode since doing so afterward 128 * might cause a bogus v_data pointer to get dereferenced 129 * elsewhere if MALLOC should block. 130 */ 131 MALLOC(pt, struct portalnode *, sizeof(struct portalnode), 132 M_TEMP, M_WAITOK); 133 134 error = getnewvnode("portal", dvp->v_mount, &portal_vnodeops, &fvp); 135 if (error) { 136 FREE(pt, M_TEMP); 137 goto bad; 138 } 139 fvp->v_type = VREG; 140 fvp->v_data = pt; 141 /* 142 * Save all of the remaining pathname and 143 * advance the namei next pointer to the end 144 * of the string. 145 */ 146 for (size = 0, path = pname; *path; path++) 147 size++; 148 cnp->cn_consume = size - cnp->cn_namelen; 149 150 pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK); 151 pt->pt_size = size+1; 152 bcopy(pname, pt->pt_arg, pt->pt_size); 153 pt->pt_fileid = portal_fileid++; 154 155 *vpp = fvp; 156 vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, td); 157 error = insmntque(fvp, dvp->v_mount); 158 if (error != 0) { 159 *vpp = NULLVP; 160 return (error); 161 } 162 return (0); 163 164 bad:; 165 if (fvp) 166 vrele(fvp); 167 return (error); 168 } 169 170 static int 171 portal_connect(so, so2) 172 struct socket *so; 173 struct socket *so2; 174 { 175 /* from unp_connect, bypassing the namei stuff... */ 176 struct socket *so3; 177 struct unpcb *unp2; 178 struct unpcb *unp3; 179 180 if (so2 == 0) 181 return (ECONNREFUSED); 182 183 if (so->so_type != so2->so_type) 184 return (EPROTOTYPE); 185 186 if ((so2->so_options & SO_ACCEPTCONN) == 0) 187 return (ECONNREFUSED); 188 189 if ((so3 = sonewconn(so2, 0)) == 0) 190 return (ECONNREFUSED); 191 192 unp2 = sotounpcb(so2); 193 unp3 = sotounpcb(so3); 194 if (unp2->unp_addr) 195 unp3->unp_addr = (struct sockaddr_un *) 196 sodupsockaddr((struct sockaddr *)unp2->unp_addr, 197 M_NOWAIT); 198 so2 = so3; 199 200 return (soconnect2(so, so2)); 201 } 202 203 static int 204 portal_open(ap) 205 struct vop_open_args /* { 206 struct vnode *a_vp; 207 int a_mode; 208 struct ucred *a_cred; 209 struct thread *a_td; 210 } */ *ap; 211 { 212 struct socket *so = 0; 213 struct portalnode *pt; 214 struct thread *td = ap->a_td; 215 struct vnode *vp = ap->a_vp; 216 struct uio auio; 217 struct iovec aiov[2]; 218 int res; 219 struct mbuf *cm = 0; 220 struct cmsghdr *cmsg; 221 int newfds; 222 int *ip; 223 int fd; 224 int error; 225 int len; 226 struct portalmount *fmp; 227 struct file *fp; 228 struct portal_cred pcred; 229 230 /* 231 * Nothing to do when opening the root node. 232 */ 233 if (vp->v_vflag & VV_ROOT) 234 return (0); 235 236 /* 237 * Can't be opened unless the caller is set up 238 * to deal with the side effects. Check for this 239 * by testing whether td_dupfd has been set. 240 */ 241 if (td->td_dupfd >= 0) 242 return (ENODEV); 243 244 pt = VTOPORTAL(vp); 245 fmp = VFSTOPORTAL(vp->v_mount); 246 247 /* 248 * Create a new socket. 249 */ 250 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_td->td_ucred, 251 ap->a_td); 252 if (error) 253 goto bad; 254 255 /* 256 * Reserve some buffer space 257 */ 258 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */ 259 error = soreserve(so, res, res); 260 if (error) 261 goto bad; 262 263 /* 264 * Kick off connection 265 */ 266 error = portal_connect(so, fmp->pm_server->f_data); 267 if (error) 268 goto bad; 269 270 /* 271 * Wait for connection to complete 272 */ 273 /* 274 * XXX: Since the mount point is holding a reference on the 275 * underlying server socket, it is not easy to find out whether 276 * the server process is still running. To handle this problem 277 * we loop waiting for the new socket to be connected (something 278 * which will only happen if the server is still running) or for 279 * the reference count on the server socket to drop to 1, which 280 * will happen if the server dies. Sleep for 5 second intervals 281 * and keep polling the reference count. XXX. 282 */ 283 SOCK_LOCK(so); 284 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 285 if (fmp->pm_server->f_count == 1) { 286 SOCK_UNLOCK(so); 287 error = ECONNREFUSED; 288 goto bad; 289 } 290 (void) msleep((caddr_t) &so->so_timeo, SOCK_MTX(so), PSOCK, 291 "portalcon", 5 * hz); 292 } 293 SOCK_UNLOCK(so); 294 295 if (so->so_error) { 296 error = so->so_error; 297 goto bad; 298 } 299 300 /* 301 * Set miscellaneous flags 302 */ 303 SOCKBUF_LOCK(&so->so_rcv); 304 so->so_rcv.sb_timeo = 0; 305 so->so_rcv.sb_flags |= SB_NOINTR; 306 SOCKBUF_UNLOCK(&so->so_rcv); 307 SOCKBUF_LOCK(&so->so_snd); 308 so->so_snd.sb_timeo = 0; 309 so->so_snd.sb_flags |= SB_NOINTR; 310 SOCKBUF_UNLOCK(&so->so_snd); 311 312 313 pcred.pcr_flag = ap->a_mode; 314 pcred.pcr_uid = ap->a_cred->cr_uid; 315 pcred.pcr_ngroups = ap->a_cred->cr_ngroups; 316 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t)); 317 aiov[0].iov_base = (caddr_t) &pcred; 318 aiov[0].iov_len = sizeof(pcred); 319 aiov[1].iov_base = pt->pt_arg; 320 aiov[1].iov_len = pt->pt_size; 321 auio.uio_iov = aiov; 322 auio.uio_iovcnt = 2; 323 auio.uio_rw = UIO_WRITE; 324 auio.uio_segflg = UIO_SYSSPACE; 325 auio.uio_td = td; 326 auio.uio_offset = 0; 327 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len; 328 329 error = sosend(so, (struct sockaddr *) 0, &auio, 330 (struct mbuf *) 0, (struct mbuf *) 0, 0 , td); 331 if (error) 332 goto bad; 333 334 len = auio.uio_resid = sizeof(int); 335 do { 336 struct mbuf *m = 0; 337 int flags = MSG_WAITALL; 338 error = soreceive(so, (struct sockaddr **) 0, &auio, 339 &m, &cm, &flags); 340 if (error) 341 goto bad; 342 343 /* 344 * Grab an error code from the mbuf. 345 */ 346 if (m) { 347 m = m_pullup(m, sizeof(int)); /* Needed? */ 348 if (m) { 349 error = *(mtod(m, int *)); 350 m_freem(m); 351 } else { 352 error = EINVAL; 353 } 354 } else { 355 if (cm == 0) { 356 error = ECONNRESET; /* XXX */ 357 #ifdef notdef 358 break; 359 #endif 360 } 361 } 362 } while (cm == 0 && auio.uio_resid == len && !error); 363 364 if (cm == 0) 365 goto bad; 366 367 if (auio.uio_resid) { 368 error = 0; 369 #ifdef notdef 370 error = EMSGSIZE; 371 goto bad; 372 #endif 373 } 374 375 /* 376 * XXX: Break apart the control message, and retrieve the 377 * received file descriptor. Note that more than one descriptor 378 * may have been received, or that the rights chain may have more 379 * than a single mbuf in it. What to do? 380 */ 381 cmsg = mtod(cm, struct cmsghdr *); 382 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int); 383 if (newfds == 0) { 384 error = ECONNREFUSED; 385 goto bad; 386 } 387 /* 388 * At this point the rights message consists of a control message 389 * header, followed by a data region containing a vector of 390 * integer file descriptors. The fds were allocated by the action 391 * of receiving the control message. 392 */ 393 ip = (int *) (cmsg + 1); 394 fd = *ip++; 395 if (newfds > 1) { 396 /* 397 * Close extra fds. 398 */ 399 int i; 400 printf("portal_open: %d extra fds\n", newfds - 1); 401 for (i = 1; i < newfds; i++) { 402 portal_closefd(td, *ip); 403 ip++; 404 } 405 } 406 407 /* 408 * Check that the mode the file is being opened for is a subset 409 * of the mode of the existing descriptor. 410 */ 411 if ((error = fget(td, fd, &fp)) != 0) 412 goto bad; 413 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) { 414 fdrop(fp, td); 415 portal_closefd(td, fd); 416 error = EACCES; 417 goto bad; 418 } 419 fdrop(fp, td); 420 421 /* 422 * Save the dup fd in the proc structure then return the 423 * special error code (ENXIO) which causes magic things to 424 * happen in vn_open. The whole concept is, well, hmmm. 425 */ 426 td->td_dupfd = fd; 427 error = ENXIO; 428 429 bad:; 430 /* 431 * And discard the control message. 432 */ 433 if (cm) { 434 m_freem(cm); 435 } 436 437 if (so) { 438 soshutdown(so, 2); 439 soclose(so); 440 } 441 return (error); 442 } 443 444 static int 445 portal_getattr(ap) 446 struct vop_getattr_args /* { 447 struct vnode *a_vp; 448 struct vattr *a_vap; 449 struct ucred *a_cred; 450 struct thread *a_td; 451 } */ *ap; 452 { 453 struct vnode *vp = ap->a_vp; 454 struct vattr *vap = ap->a_vap; 455 456 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 = NODEV; 466 /* vap->va_qbytes = 0; */ 467 vap->va_bytes = 0; 468 vap->va_filerev = 0; 469 /* vap->va_qsize = 0; */ 470 if (vp->v_vflag & VV_ROOT) { 471 vap->va_type = VDIR; 472 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR| 473 S_IRGRP|S_IWGRP|S_IXGRP| 474 S_IROTH|S_IWOTH|S_IXOTH; 475 vap->va_nlink = 2; 476 vap->va_fileid = 2; 477 } else { 478 vap->va_type = VREG; 479 vap->va_mode = S_IRUSR|S_IWUSR| 480 S_IRGRP|S_IWGRP| 481 S_IROTH|S_IWOTH; 482 vap->va_nlink = 1; 483 vap->va_fileid = VTOPORTAL(vp)->pt_fileid; 484 } 485 return (0); 486 } 487 488 static int 489 portal_setattr(ap) 490 struct vop_setattr_args /* { 491 struct vnode *a_vp; 492 struct vattr *a_vap; 493 struct ucred *a_cred; 494 struct thread *a_td; 495 } */ *ap; 496 { 497 498 /* 499 * Can't mess with the root vnode 500 */ 501 if (ap->a_vp->v_vflag & VV_ROOT) 502 return (EACCES); 503 504 if (ap->a_vap->va_flags != VNOVAL) 505 return (EOPNOTSUPP); 506 507 return (0); 508 } 509 510 /* 511 * Fake readdir, just return empty directory. 512 * It is hard to deal with '.' and '..' so don't bother. 513 */ 514 static int 515 portal_readdir(ap) 516 struct vop_readdir_args /* { 517 struct vnode *a_vp; 518 struct uio *a_uio; 519 struct ucred *a_cred; 520 int *a_eofflag; 521 u_long *a_cookies; 522 int a_ncookies; 523 } */ *ap; 524 { 525 526 /* 527 * We don't allow exporting portal mounts, and currently local 528 * requests do not need cookies. 529 */ 530 if (ap->a_ncookies) 531 panic("portal_readdir: not hungry"); 532 533 return (0); 534 } 535 536 static int 537 portal_reclaim(ap) 538 struct vop_reclaim_args /* { 539 struct vnode *a_vp; 540 } */ *ap; 541 { 542 struct portalnode *pt = VTOPORTAL(ap->a_vp); 543 544 if (pt->pt_arg) { 545 free((caddr_t) pt->pt_arg, M_TEMP); 546 pt->pt_arg = 0; 547 } 548 FREE(ap->a_vp->v_data, M_TEMP); 549 ap->a_vp->v_data = 0; 550 551 return (0); 552 } 553 554 struct vop_vector portal_vnodeops = { 555 .vop_default = &default_vnodeops, 556 557 .vop_access = VOP_NULL, 558 .vop_getattr = portal_getattr, 559 .vop_lookup = portal_lookup, 560 .vop_open = portal_open, 561 .vop_pathconf = vop_stdpathconf, 562 .vop_readdir = portal_readdir, 563 .vop_reclaim = portal_reclaim, 564 .vop_setattr = portal_setattr, 565 };
Cache object: ea9962ccd2ecdb11d83fc1bbecb075f7
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