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 * $FreeBSD$ 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 #include <net/vnet.h> 64 65 static int portal_fileid = PORTAL_ROOTFILEID+1; 66 67 static void portal_closefd(struct thread *td, int fd); 68 static int portal_connect(struct socket *so, struct socket *so2); 69 static vop_getattr_t portal_getattr; 70 static vop_lookup_t portal_lookup; 71 static vop_open_t portal_open; 72 static vop_readdir_t portal_readdir; 73 static vop_reclaim_t portal_reclaim; 74 static vop_setattr_t portal_setattr; 75 76 static void 77 portal_closefd(td, fd) 78 struct thread *td; 79 int fd; 80 { 81 int error; 82 83 error = kern_close(td, fd); 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 portalnode *pt; 109 int error; 110 struct vnode *fvp = 0; 111 char *path; 112 int size; 113 114 *vpp = NULLVP; 115 116 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 117 return (EROFS); 118 119 if (cnp->cn_namelen == 1 && *pname == '.') { 120 *vpp = dvp; 121 VREF(dvp); 122 return (0); 123 } 124 KASSERT((cnp->cn_flags & ISDOTDOT) == 0, 125 ("portal_lookup: Can not handle dotdot lookups.")); 126 127 /* 128 * Do the MALLOC before the getnewvnode since doing so afterward 129 * might cause a bogus v_data pointer to get dereferenced 130 * elsewhere if MALLOC should block. 131 */ 132 pt = malloc(sizeof(struct portalnode), 133 M_TEMP, M_WAITOK); 134 135 error = getnewvnode("portal", dvp->v_mount, &portal_vnodeops, &fvp); 136 if (error) { 137 free(pt, M_TEMP); 138 goto bad; 139 } 140 fvp->v_type = VREG; 141 fvp->v_data = pt; 142 /* 143 * Save all of the remaining pathname and 144 * advance the namei next pointer to the end 145 * of the string. 146 */ 147 for (size = 0, path = pname; *path; path++) 148 size++; 149 cnp->cn_consume = size - cnp->cn_namelen; 150 151 pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK); 152 pt->pt_size = size+1; 153 bcopy(pname, pt->pt_arg, pt->pt_size); 154 pt->pt_fileid = portal_fileid++; 155 156 *vpp = fvp; 157 vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY); 158 error = insmntque(fvp, dvp->v_mount); 159 if (error != 0) { 160 *vpp = NULLVP; 161 return (error); 162 } 163 return (0); 164 165 bad:; 166 if (fvp) 167 vrele(fvp); 168 return (error); 169 } 170 171 static int 172 portal_connect(so, so2) 173 struct socket *so; 174 struct socket *so2; 175 { 176 /* from unp_connect, bypassing the namei stuff... */ 177 struct socket *so3; 178 struct unpcb *unp2; 179 struct unpcb *unp3; 180 181 if (so2 == 0) 182 return (ECONNREFUSED); 183 184 if (so->so_type != so2->so_type) 185 return (EPROTOTYPE); 186 187 if ((so2->so_options & SO_ACCEPTCONN) == 0) 188 return (ECONNREFUSED); 189 190 CURVNET_SET(so2->so_vnet); 191 if ((so3 = sonewconn(so2, 0)) == 0) { 192 CURVNET_RESTORE(); 193 return (ECONNREFUSED); 194 } 195 CURVNET_RESTORE(); 196 197 unp2 = sotounpcb(so2); 198 unp3 = sotounpcb(so3); 199 if (unp2->unp_addr) 200 unp3->unp_addr = (struct sockaddr_un *) 201 sodupsockaddr((struct sockaddr *)unp2->unp_addr, 202 M_NOWAIT); 203 so2 = so3; 204 205 return (soconnect2(so, so2)); 206 } 207 208 static int 209 portal_open(ap) 210 struct vop_open_args /* { 211 struct vnode *a_vp; 212 int a_mode; 213 struct ucred *a_cred; 214 struct thread *a_td; 215 } */ *ap; 216 { 217 struct socket *so = 0; 218 struct portalnode *pt; 219 struct thread *td = ap->a_td; 220 struct vnode *vp = ap->a_vp; 221 struct uio auio; 222 struct iovec aiov[2]; 223 int res; 224 struct mbuf *cm = 0; 225 struct cmsghdr *cmsg; 226 int newfds; 227 int *ip; 228 int fd; 229 int error; 230 int len; 231 struct portalmount *fmp; 232 struct file *fp; 233 struct portal_cred pcred; 234 235 /* 236 * Nothing to do when opening the root node. 237 */ 238 if (vp->v_vflag & VV_ROOT) 239 return (0); 240 241 /* 242 * Can't be opened unless the caller is set up 243 * to deal with the side effects. Check for this 244 * by testing whether td_dupfd has been set. 245 */ 246 if (td->td_dupfd >= 0) 247 return (ENODEV); 248 249 pt = VTOPORTAL(vp); 250 fmp = VFSTOPORTAL(vp->v_mount); 251 252 /* 253 * Create a new socket. 254 */ 255 error = socreate(AF_UNIX, &so, SOCK_STREAM, 0, ap->a_td->td_ucred, 256 ap->a_td); 257 if (error) 258 goto bad; 259 260 /* 261 * Reserve some buffer space 262 */ 263 res = pt->pt_size + sizeof(pcred) + 512; /* XXX */ 264 error = soreserve(so, res, res); 265 if (error) 266 goto bad; 267 268 /* 269 * Kick off connection 270 */ 271 error = portal_connect(so, fmp->pm_server->f_data); 272 if (error) 273 goto bad; 274 275 /* 276 * Wait for connection to complete 277 */ 278 /* 279 * XXX: Since the mount point is holding a reference on the 280 * underlying server socket, it is not easy to find out whether 281 * the server process is still running. To handle this problem 282 * we loop waiting for the new socket to be connected (something 283 * which will only happen if the server is still running) or for 284 * the reference count on the server socket to drop to 1, which 285 * will happen if the server dies. Sleep for 5 second intervals 286 * and keep polling the reference count. XXX. 287 */ 288 SOCK_LOCK(so); 289 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 290 if (fmp->pm_server->f_count == 1) { 291 SOCK_UNLOCK(so); 292 error = ECONNREFUSED; 293 goto bad; 294 } 295 (void) msleep((caddr_t) &so->so_timeo, SOCK_MTX(so), PSOCK, 296 "portalcon", 5 * hz); 297 } 298 SOCK_UNLOCK(so); 299 300 if (so->so_error) { 301 error = so->so_error; 302 goto bad; 303 } 304 305 /* 306 * Set miscellaneous flags 307 */ 308 SOCKBUF_LOCK(&so->so_rcv); 309 so->so_rcv.sb_timeo = 0; 310 so->so_rcv.sb_flags |= SB_NOINTR; 311 SOCKBUF_UNLOCK(&so->so_rcv); 312 SOCKBUF_LOCK(&so->so_snd); 313 so->so_snd.sb_timeo = 0; 314 so->so_snd.sb_flags |= SB_NOINTR; 315 SOCKBUF_UNLOCK(&so->so_snd); 316 317 318 pcred.pcr_flag = ap->a_mode; 319 pcred.pcr_uid = ap->a_cred->cr_uid; 320 pcred.pcr_ngroups = MIN(ap->a_cred->cr_ngroups, XU_NGROUPS); 321 bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, 322 pcred.pcr_ngroups * sizeof(gid_t)); 323 aiov[0].iov_base = (caddr_t) &pcred; 324 aiov[0].iov_len = sizeof(pcred); 325 aiov[1].iov_base = pt->pt_arg; 326 aiov[1].iov_len = pt->pt_size; 327 auio.uio_iov = aiov; 328 auio.uio_iovcnt = 2; 329 auio.uio_rw = UIO_WRITE; 330 auio.uio_segflg = UIO_SYSSPACE; 331 auio.uio_td = td; 332 auio.uio_offset = 0; 333 auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len; 334 335 error = sosend(so, (struct sockaddr *) 0, &auio, 336 (struct mbuf *) 0, (struct mbuf *) 0, 0 , td); 337 if (error) 338 goto bad; 339 340 len = auio.uio_resid = sizeof(int); 341 do { 342 struct mbuf *m = 0; 343 int flags = MSG_WAITALL; 344 error = soreceive(so, (struct sockaddr **) 0, &auio, 345 &m, &cm, &flags); 346 if (error) 347 goto bad; 348 349 /* 350 * Grab an error code from the mbuf. 351 */ 352 if (m) { 353 m = m_pullup(m, sizeof(int)); /* Needed? */ 354 if (m) { 355 error = *(mtod(m, int *)); 356 m_freem(m); 357 } else { 358 error = EINVAL; 359 } 360 } else { 361 if (cm == 0) { 362 error = ECONNRESET; /* XXX */ 363 #ifdef notdef 364 break; 365 #endif 366 } 367 } 368 } while (cm == 0 && auio.uio_resid == len && !error); 369 370 if (cm == 0) 371 goto bad; 372 373 if (auio.uio_resid) { 374 error = 0; 375 #ifdef notdef 376 error = EMSGSIZE; 377 goto bad; 378 #endif 379 } 380 381 /* 382 * XXX: Break apart the control message, and retrieve the 383 * received file descriptor. Note that more than one descriptor 384 * may have been received, or that the rights chain may have more 385 * than a single mbuf in it. What to do? 386 */ 387 cmsg = mtod(cm, struct cmsghdr *); 388 newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int); 389 if (newfds == 0) { 390 error = ECONNREFUSED; 391 goto bad; 392 } 393 /* 394 * At this point the rights message consists of a control message 395 * header, followed by a data region containing a vector of 396 * integer file descriptors. The fds were allocated by the action 397 * of receiving the control message. 398 */ 399 ip = (int *) (cmsg + 1); 400 fd = *ip++; 401 if (newfds > 1) { 402 /* 403 * Close extra fds. 404 */ 405 int i; 406 printf("portal_open: %d extra fds\n", newfds - 1); 407 for (i = 1; i < newfds; i++) { 408 portal_closefd(td, *ip); 409 ip++; 410 } 411 } 412 413 /* 414 * Check that the mode the file is being opened for is a subset 415 * of the mode of the existing descriptor. 416 */ 417 if ((error = fget(td, fd, &fp)) != 0) 418 goto bad; 419 if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) { 420 fdrop(fp, td); 421 portal_closefd(td, fd); 422 error = EACCES; 423 goto bad; 424 } 425 fdrop(fp, td); 426 427 /* 428 * Save the dup fd in the proc structure then return the 429 * special error code (ENXIO) which causes magic things to 430 * happen in vn_open. The whole concept is, well, hmmm. 431 */ 432 td->td_dupfd = fd; 433 error = ENXIO; 434 435 bad:; 436 /* 437 * And discard the control message. 438 */ 439 if (cm) { 440 m_freem(cm); 441 } 442 443 if (so) { 444 soshutdown(so, 2); 445 soclose(so); 446 } 447 return (error); 448 } 449 450 static int 451 portal_getattr(ap) 452 struct vop_getattr_args /* { 453 struct vnode *a_vp; 454 struct vattr *a_vap; 455 struct ucred *a_cred; 456 } */ *ap; 457 { 458 struct vnode *vp = ap->a_vp; 459 struct vattr *vap = ap->a_vap; 460 461 vap->va_uid = 0; 462 vap->va_gid = 0; 463 vap->va_size = DEV_BSIZE; 464 vap->va_blocksize = DEV_BSIZE; 465 nanotime(&vap->va_atime); 466 vap->va_mtime = vap->va_atime; 467 vap->va_ctime = vap->va_mtime; 468 vap->va_gen = 0; 469 vap->va_flags = 0; 470 vap->va_rdev = NODEV; 471 /* vap->va_qbytes = 0; */ 472 vap->va_bytes = 0; 473 vap->va_filerev = 0; 474 /* vap->va_qsize = 0; */ 475 if (vp->v_vflag & VV_ROOT) { 476 vap->va_type = VDIR; 477 vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR| 478 S_IRGRP|S_IWGRP|S_IXGRP| 479 S_IROTH|S_IWOTH|S_IXOTH; 480 vap->va_nlink = 2; 481 vap->va_fileid = 2; 482 } else { 483 vap->va_type = VREG; 484 vap->va_mode = S_IRUSR|S_IWUSR| 485 S_IRGRP|S_IWGRP| 486 S_IROTH|S_IWOTH; 487 vap->va_nlink = 1; 488 vap->va_fileid = VTOPORTAL(vp)->pt_fileid; 489 } 490 return (0); 491 } 492 493 static int 494 portal_setattr(ap) 495 struct vop_setattr_args /* { 496 struct vnode *a_vp; 497 struct vattr *a_vap; 498 struct ucred *a_cred; 499 } */ *ap; 500 { 501 502 /* 503 * Can't mess with the root vnode 504 */ 505 if (ap->a_vp->v_vflag & VV_ROOT) 506 return (EACCES); 507 508 if (ap->a_vap->va_flags != VNOVAL) 509 return (EOPNOTSUPP); 510 511 return (0); 512 } 513 514 /* 515 * Fake readdir, just return empty directory. 516 * It is hard to deal with '.' and '..' so don't bother. 517 */ 518 static int 519 portal_readdir(ap) 520 struct vop_readdir_args /* { 521 struct vnode *a_vp; 522 struct uio *a_uio; 523 struct ucred *a_cred; 524 int *a_eofflag; 525 u_long *a_cookies; 526 int a_ncookies; 527 } */ *ap; 528 { 529 530 /* 531 * We don't allow exporting portal mounts, and currently local 532 * requests do not need cookies. 533 */ 534 if (ap->a_ncookies) 535 panic("portal_readdir: not hungry"); 536 537 return (0); 538 } 539 540 static int 541 portal_reclaim(ap) 542 struct vop_reclaim_args /* { 543 struct vnode *a_vp; 544 } */ *ap; 545 { 546 struct portalnode *pt = VTOPORTAL(ap->a_vp); 547 548 if (pt->pt_arg) { 549 free((caddr_t) pt->pt_arg, M_TEMP); 550 pt->pt_arg = 0; 551 } 552 free(ap->a_vp->v_data, M_TEMP); 553 ap->a_vp->v_data = 0; 554 555 return (0); 556 } 557 558 struct vop_vector portal_vnodeops = { 559 .vop_default = &default_vnodeops, 560 561 .vop_access = VOP_NULL, 562 .vop_getattr = portal_getattr, 563 .vop_lookup = portal_lookup, 564 .vop_open = portal_open, 565 .vop_pathconf = vop_stdpathconf, 566 .vop_readdir = portal_readdir, 567 .vop_reclaim = portal_reclaim, 568 .vop_setattr = portal_setattr, 569 };
Cache object: 2d01956feb06ee7f03f1e8766401466e
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