| 1 | /* $NetBSD: nfs_srvsocket.c,v 1.4 2009/09/03 20:59:12 tls Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1989, 1991, 1993, 1995 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to Berkeley by |
| 8 | * Rick Macklem at The University of Guelph. |
| 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. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | * |
| 34 | * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 |
| 35 | */ |
| 36 | |
| 37 | /* |
| 38 | * Socket operations for use by nfs |
| 39 | */ |
| 40 | |
| 41 | #include <sys/cdefs.h> |
| 42 | __KERNEL_RCSID(0, "$NetBSD: nfs_srvsocket.c,v 1.4 2009/09/03 20:59:12 tls Exp $" ); |
| 43 | |
| 44 | #include <sys/param.h> |
| 45 | #include <sys/systm.h> |
| 46 | #include <sys/evcnt.h> |
| 47 | #include <sys/callout.h> |
| 48 | #include <sys/proc.h> |
| 49 | #include <sys/mount.h> |
| 50 | #include <sys/kernel.h> |
| 51 | #include <sys/kmem.h> |
| 52 | #include <sys/mbuf.h> |
| 53 | #include <sys/vnode.h> |
| 54 | #include <sys/domain.h> |
| 55 | #include <sys/protosw.h> |
| 56 | #include <sys/socket.h> |
| 57 | #include <sys/socketvar.h> |
| 58 | #include <sys/syslog.h> |
| 59 | #include <sys/tprintf.h> |
| 60 | #include <sys/namei.h> |
| 61 | #include <sys/signal.h> |
| 62 | #include <sys/signalvar.h> |
| 63 | #include <sys/kauth.h> |
| 64 | |
| 65 | #include <netinet/in.h> |
| 66 | #include <netinet/tcp.h> |
| 67 | |
| 68 | #include <nfs/rpcv2.h> |
| 69 | #include <nfs/nfsproto.h> |
| 70 | #include <nfs/nfs.h> |
| 71 | #include <nfs/xdr_subs.h> |
| 72 | #include <nfs/nfsm_subs.h> |
| 73 | #include <nfs/nfsmount.h> |
| 74 | #include <nfs/nfsnode.h> |
| 75 | #include <nfs/nfsrtt.h> |
| 76 | #include <nfs/nfs_var.h> |
| 77 | |
| 78 | static void nfsrv_wakenfsd_locked(struct nfssvc_sock *); |
| 79 | |
| 80 | int (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *, |
| 81 | struct nfssvc_sock *, struct lwp *, |
| 82 | struct mbuf **) = { |
| 83 | nfsrv_null, |
| 84 | nfsrv_getattr, |
| 85 | nfsrv_setattr, |
| 86 | nfsrv_lookup, |
| 87 | nfsrv3_access, |
| 88 | nfsrv_readlink, |
| 89 | nfsrv_read, |
| 90 | nfsrv_write, |
| 91 | nfsrv_create, |
| 92 | nfsrv_mkdir, |
| 93 | nfsrv_symlink, |
| 94 | nfsrv_mknod, |
| 95 | nfsrv_remove, |
| 96 | nfsrv_rmdir, |
| 97 | nfsrv_rename, |
| 98 | nfsrv_link, |
| 99 | nfsrv_readdir, |
| 100 | nfsrv_readdirplus, |
| 101 | nfsrv_statfs, |
| 102 | nfsrv_fsinfo, |
| 103 | nfsrv_pathconf, |
| 104 | nfsrv_commit, |
| 105 | nfsrv_noop |
| 106 | }; |
| 107 | |
| 108 | /* |
| 109 | * Socket upcall routine for the nfsd sockets. |
| 110 | * The void *arg is a pointer to the "struct nfssvc_sock". |
| 111 | */ |
| 112 | void |
| 113 | nfsrv_soupcall(struct socket *so, void *arg, int events, int waitflag) |
| 114 | { |
| 115 | struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; |
| 116 | |
| 117 | nfsdsock_setbits(slp, SLP_A_NEEDQ); |
| 118 | nfsrv_wakenfsd(slp); |
| 119 | } |
| 120 | |
| 121 | void |
| 122 | nfsrv_rcv(struct nfssvc_sock *slp) |
| 123 | { |
| 124 | struct socket *so; |
| 125 | struct mbuf *m; |
| 126 | struct mbuf *mp, *nam; |
| 127 | struct uio auio; |
| 128 | int flags; |
| 129 | int error; |
| 130 | int setflags = 0; |
| 131 | |
| 132 | error = nfsdsock_lock(slp, true); |
| 133 | if (error) { |
| 134 | setflags |= SLP_A_NEEDQ; |
| 135 | goto dorecs_unlocked; |
| 136 | } |
| 137 | |
| 138 | nfsdsock_clearbits(slp, SLP_A_NEEDQ); |
| 139 | |
| 140 | so = slp->ns_so; |
| 141 | if (so->so_type == SOCK_STREAM) { |
| 142 | /* |
| 143 | * Do soreceive(). |
| 144 | */ |
| 145 | auio.uio_resid = 1000000000; |
| 146 | /* not need to setup uio_vmspace */ |
| 147 | flags = MSG_DONTWAIT; |
| 148 | error = (*so->so_receive)(so, &nam, &auio, &mp, NULL, &flags); |
| 149 | if (error || mp == NULL) { |
| 150 | if (error == EWOULDBLOCK) |
| 151 | setflags |= SLP_A_NEEDQ; |
| 152 | else |
| 153 | setflags |= SLP_A_DISCONN; |
| 154 | goto dorecs; |
| 155 | } |
| 156 | m = mp; |
| 157 | m_claimm(m, &nfs_mowner); |
| 158 | if (slp->ns_rawend) { |
| 159 | slp->ns_rawend->m_next = m; |
| 160 | slp->ns_cc += 1000000000 - auio.uio_resid; |
| 161 | } else { |
| 162 | slp->ns_raw = m; |
| 163 | slp->ns_cc = 1000000000 - auio.uio_resid; |
| 164 | } |
| 165 | while (m->m_next) |
| 166 | m = m->m_next; |
| 167 | slp->ns_rawend = m; |
| 168 | |
| 169 | /* |
| 170 | * Now try and parse record(s) out of the raw stream data. |
| 171 | */ |
| 172 | error = nfsrv_getstream(slp, M_WAIT); |
| 173 | if (error) { |
| 174 | if (error == EPERM) |
| 175 | setflags |= SLP_A_DISCONN; |
| 176 | else |
| 177 | setflags |= SLP_A_NEEDQ; |
| 178 | } |
| 179 | } else { |
| 180 | do { |
| 181 | auio.uio_resid = 1000000000; |
| 182 | /* not need to setup uio_vmspace */ |
| 183 | flags = MSG_DONTWAIT; |
| 184 | error = (*so->so_receive)(so, &nam, &auio, &mp, NULL, |
| 185 | &flags); |
| 186 | if (mp) { |
| 187 | if (nam) { |
| 188 | m = nam; |
| 189 | m->m_next = mp; |
| 190 | } else |
| 191 | m = mp; |
| 192 | m_claimm(m, &nfs_mowner); |
| 193 | if (slp->ns_recend) |
| 194 | slp->ns_recend->m_nextpkt = m; |
| 195 | else |
| 196 | slp->ns_rec = m; |
| 197 | slp->ns_recend = m; |
| 198 | m->m_nextpkt = (struct mbuf *)0; |
| 199 | } |
| 200 | if (error) { |
| 201 | if ((so->so_proto->pr_flags & PR_CONNREQUIRED) |
| 202 | && error != EWOULDBLOCK) { |
| 203 | setflags |= SLP_A_DISCONN; |
| 204 | goto dorecs; |
| 205 | } |
| 206 | } |
| 207 | } while (mp); |
| 208 | } |
| 209 | dorecs: |
| 210 | nfsdsock_unlock(slp); |
| 211 | |
| 212 | dorecs_unlocked: |
| 213 | if (setflags) { |
| 214 | nfsdsock_setbits(slp, setflags); |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | int |
| 219 | nfsdsock_lock(struct nfssvc_sock *slp, bool waitok) |
| 220 | { |
| 221 | |
| 222 | mutex_enter(&slp->ns_lock); |
| 223 | while ((~slp->ns_flags & (SLP_BUSY|SLP_VALID)) == 0) { |
| 224 | if (!waitok) { |
| 225 | mutex_exit(&slp->ns_lock); |
| 226 | return EWOULDBLOCK; |
| 227 | } |
| 228 | cv_wait(&slp->ns_cv, &slp->ns_lock); |
| 229 | } |
| 230 | if ((slp->ns_flags & SLP_VALID) == 0) { |
| 231 | mutex_exit(&slp->ns_lock); |
| 232 | return EINVAL; |
| 233 | } |
| 234 | KASSERT((slp->ns_flags & SLP_BUSY) == 0); |
| 235 | slp->ns_flags |= SLP_BUSY; |
| 236 | mutex_exit(&slp->ns_lock); |
| 237 | |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | void |
| 242 | nfsdsock_unlock(struct nfssvc_sock *slp) |
| 243 | { |
| 244 | |
| 245 | mutex_enter(&slp->ns_lock); |
| 246 | KASSERT((slp->ns_flags & SLP_BUSY) != 0); |
| 247 | cv_broadcast(&slp->ns_cv); |
| 248 | slp->ns_flags &= ~SLP_BUSY; |
| 249 | mutex_exit(&slp->ns_lock); |
| 250 | } |
| 251 | |
| 252 | int |
| 253 | nfsdsock_drain(struct nfssvc_sock *slp) |
| 254 | { |
| 255 | int error = 0; |
| 256 | |
| 257 | mutex_enter(&slp->ns_lock); |
| 258 | if ((slp->ns_flags & SLP_VALID) == 0) { |
| 259 | error = EINVAL; |
| 260 | goto done; |
| 261 | } |
| 262 | slp->ns_flags &= ~SLP_VALID; |
| 263 | while ((slp->ns_flags & SLP_BUSY) != 0) { |
| 264 | cv_wait(&slp->ns_cv, &slp->ns_lock); |
| 265 | } |
| 266 | done: |
| 267 | mutex_exit(&slp->ns_lock); |
| 268 | |
| 269 | return error; |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * Try and extract an RPC request from the mbuf data list received on a |
| 274 | * stream socket. The "waitflag" argument indicates whether or not it |
| 275 | * can sleep. |
| 276 | */ |
| 277 | int |
| 278 | nfsrv_getstream(struct nfssvc_sock *slp, int waitflag) |
| 279 | { |
| 280 | struct mbuf *m, **mpp; |
| 281 | struct mbuf *recm; |
| 282 | u_int32_t recmark; |
| 283 | int error = 0; |
| 284 | |
| 285 | KASSERT((slp->ns_flags & SLP_BUSY) != 0); |
| 286 | for (;;) { |
| 287 | if (slp->ns_reclen == 0) { |
| 288 | if (slp->ns_cc < NFSX_UNSIGNED) { |
| 289 | break; |
| 290 | } |
| 291 | m = slp->ns_raw; |
| 292 | m_copydata(m, 0, NFSX_UNSIGNED, (void *)&recmark); |
| 293 | m_adj(m, NFSX_UNSIGNED); |
| 294 | slp->ns_cc -= NFSX_UNSIGNED; |
| 295 | recmark = ntohl(recmark); |
| 296 | slp->ns_reclen = recmark & ~0x80000000; |
| 297 | if (recmark & 0x80000000) |
| 298 | slp->ns_sflags |= SLP_S_LASTFRAG; |
| 299 | else |
| 300 | slp->ns_sflags &= ~SLP_S_LASTFRAG; |
| 301 | if (slp->ns_reclen > NFS_MAXPACKET) { |
| 302 | error = EPERM; |
| 303 | break; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * Now get the record part. |
| 309 | * |
| 310 | * Note that slp->ns_reclen may be 0. Linux sometimes |
| 311 | * generates 0-length records. |
| 312 | */ |
| 313 | if (slp->ns_cc == slp->ns_reclen) { |
| 314 | recm = slp->ns_raw; |
| 315 | slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; |
| 316 | slp->ns_cc = slp->ns_reclen = 0; |
| 317 | } else if (slp->ns_cc > slp->ns_reclen) { |
| 318 | recm = slp->ns_raw; |
| 319 | m = m_split(recm, slp->ns_reclen, waitflag); |
| 320 | if (m == NULL) { |
| 321 | error = EWOULDBLOCK; |
| 322 | break; |
| 323 | } |
| 324 | m_claimm(recm, &nfs_mowner); |
| 325 | slp->ns_raw = m; |
| 326 | if (m->m_next == NULL) |
| 327 | slp->ns_rawend = m; |
| 328 | slp->ns_cc -= slp->ns_reclen; |
| 329 | slp->ns_reclen = 0; |
| 330 | } else { |
| 331 | break; |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Accumulate the fragments into a record. |
| 336 | */ |
| 337 | mpp = &slp->ns_frag; |
| 338 | while (*mpp) |
| 339 | mpp = &((*mpp)->m_next); |
| 340 | *mpp = recm; |
| 341 | if (slp->ns_sflags & SLP_S_LASTFRAG) { |
| 342 | if (slp->ns_recend) |
| 343 | slp->ns_recend->m_nextpkt = slp->ns_frag; |
| 344 | else |
| 345 | slp->ns_rec = slp->ns_frag; |
| 346 | slp->ns_recend = slp->ns_frag; |
| 347 | slp->ns_frag = NULL; |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | return error; |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * Parse an RPC header. |
| 356 | */ |
| 357 | int |
| 358 | nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd, |
| 359 | struct nfsrv_descript **ndp, bool *more) |
| 360 | { |
| 361 | struct mbuf *m, *nam; |
| 362 | struct nfsrv_descript *nd; |
| 363 | int error; |
| 364 | |
| 365 | *ndp = NULL; |
| 366 | *more = false; |
| 367 | |
| 368 | if (nfsdsock_lock(slp, true)) { |
| 369 | return ENOBUFS; |
| 370 | } |
| 371 | m = slp->ns_rec; |
| 372 | if (m == NULL) { |
| 373 | nfsdsock_unlock(slp); |
| 374 | return ENOBUFS; |
| 375 | } |
| 376 | slp->ns_rec = m->m_nextpkt; |
| 377 | if (slp->ns_rec) { |
| 378 | m->m_nextpkt = NULL; |
| 379 | *more = true; |
| 380 | } else { |
| 381 | slp->ns_recend = NULL; |
| 382 | } |
| 383 | nfsdsock_unlock(slp); |
| 384 | |
| 385 | if (m->m_type == MT_SONAME) { |
| 386 | nam = m; |
| 387 | m = m->m_next; |
| 388 | nam->m_next = NULL; |
| 389 | } else |
| 390 | nam = NULL; |
| 391 | nd = nfsdreq_alloc(); |
| 392 | nd->nd_md = nd->nd_mrep = m; |
| 393 | nd->nd_nam2 = nam; |
| 394 | nd->nd_dpos = mtod(m, void *); |
| 395 | error = nfs_getreq(nd, nfsd, true); |
| 396 | if (error) { |
| 397 | m_freem(nam); |
| 398 | nfsdreq_free(nd); |
| 399 | return (error); |
| 400 | } |
| 401 | *ndp = nd; |
| 402 | nfsd->nfsd_nd = nd; |
| 403 | return (0); |
| 404 | } |
| 405 | |
| 406 | bool |
| 407 | nfsrv_timer(void) |
| 408 | { |
| 409 | struct timeval tv; |
| 410 | struct nfssvc_sock *slp; |
| 411 | u_quad_t cur_usec; |
| 412 | struct nfsrv_descript *nd; |
| 413 | bool more; |
| 414 | |
| 415 | /* |
| 416 | * Scan the write gathering queues for writes that need to be |
| 417 | * completed now. |
| 418 | */ |
| 419 | getmicrotime(&tv); |
| 420 | cur_usec = (u_quad_t)tv.tv_sec * 1000000 + (u_quad_t)tv.tv_usec; |
| 421 | more = false; |
| 422 | mutex_enter(&nfsd_lock); |
| 423 | TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { |
| 424 | nd = LIST_FIRST(&slp->ns_tq); |
| 425 | if (nd != NULL) { |
| 426 | if (nd->nd_time <= cur_usec) { |
| 427 | nfsrv_wakenfsd_locked(slp); |
| 428 | } |
| 429 | more = true; |
| 430 | } |
| 431 | } |
| 432 | mutex_exit(&nfsd_lock); |
| 433 | return more; |
| 434 | } |
| 435 | |
| 436 | /* |
| 437 | * Search for a sleeping nfsd and wake it up. |
| 438 | * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the |
| 439 | * running nfsds will go look for the work in the nfssvc_sock list. |
| 440 | */ |
| 441 | static void |
| 442 | nfsrv_wakenfsd_locked(struct nfssvc_sock *slp) |
| 443 | { |
| 444 | struct nfsd *nd; |
| 445 | |
| 446 | KASSERT(mutex_owned(&nfsd_lock)); |
| 447 | |
| 448 | if ((slp->ns_flags & SLP_VALID) == 0) |
| 449 | return; |
| 450 | if (slp->ns_gflags & SLP_G_DOREC) |
| 451 | return; |
| 452 | nd = SLIST_FIRST(&nfsd_idle_head); |
| 453 | if (nd) { |
| 454 | SLIST_REMOVE_HEAD(&nfsd_idle_head, nfsd_idle); |
| 455 | if (nd->nfsd_slp) |
| 456 | panic("nfsd wakeup" ); |
| 457 | slp->ns_sref++; |
| 458 | KASSERT(slp->ns_sref > 0); |
| 459 | nd->nfsd_slp = slp; |
| 460 | cv_signal(&nd->nfsd_cv); |
| 461 | } else { |
| 462 | slp->ns_gflags |= SLP_G_DOREC; |
| 463 | nfsd_head_flag |= NFSD_CHECKSLP; |
| 464 | TAILQ_INSERT_TAIL(&nfssvc_sockpending, slp, ns_pending); |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | void |
| 469 | nfsrv_wakenfsd(struct nfssvc_sock *slp) |
| 470 | { |
| 471 | |
| 472 | mutex_enter(&nfsd_lock); |
| 473 | nfsrv_wakenfsd_locked(slp); |
| 474 | mutex_exit(&nfsd_lock); |
| 475 | } |
| 476 | |
| 477 | int |
| 478 | nfsdsock_sendreply(struct nfssvc_sock *slp, struct nfsrv_descript *nd) |
| 479 | { |
| 480 | int error; |
| 481 | |
| 482 | if (nd->nd_mrep != NULL) { |
| 483 | m_freem(nd->nd_mrep); |
| 484 | nd->nd_mrep = NULL; |
| 485 | } |
| 486 | |
| 487 | mutex_enter(&slp->ns_lock); |
| 488 | if ((slp->ns_flags & SLP_SENDING) != 0) { |
| 489 | SIMPLEQ_INSERT_TAIL(&slp->ns_sendq, nd, nd_sendq); |
| 490 | mutex_exit(&slp->ns_lock); |
| 491 | return 0; |
| 492 | } |
| 493 | KASSERT(SIMPLEQ_EMPTY(&slp->ns_sendq)); |
| 494 | slp->ns_flags |= SLP_SENDING; |
| 495 | mutex_exit(&slp->ns_lock); |
| 496 | |
| 497 | again: |
| 498 | error = nfs_send(slp->ns_so, nd->nd_nam2, nd->nd_mreq, NULL, curlwp); |
| 499 | if (nd->nd_nam2) { |
| 500 | m_free(nd->nd_nam2); |
| 501 | } |
| 502 | nfsdreq_free(nd); |
| 503 | |
| 504 | mutex_enter(&slp->ns_lock); |
| 505 | KASSERT((slp->ns_flags & SLP_SENDING) != 0); |
| 506 | nd = SIMPLEQ_FIRST(&slp->ns_sendq); |
| 507 | if (nd != NULL) { |
| 508 | SIMPLEQ_REMOVE_HEAD(&slp->ns_sendq, nd_sendq); |
| 509 | mutex_exit(&slp->ns_lock); |
| 510 | goto again; |
| 511 | } |
| 512 | slp->ns_flags &= ~SLP_SENDING; |
| 513 | mutex_exit(&slp->ns_lock); |
| 514 | |
| 515 | return error; |
| 516 | } |
| 517 | |
| 518 | void |
| 519 | nfsdsock_setbits(struct nfssvc_sock *slp, int bits) |
| 520 | { |
| 521 | |
| 522 | mutex_enter(&slp->ns_alock); |
| 523 | slp->ns_aflags |= bits; |
| 524 | mutex_exit(&slp->ns_alock); |
| 525 | } |
| 526 | |
| 527 | void |
| 528 | nfsdsock_clearbits(struct nfssvc_sock *slp, int bits) |
| 529 | { |
| 530 | |
| 531 | mutex_enter(&slp->ns_alock); |
| 532 | slp->ns_aflags &= ~bits; |
| 533 | mutex_exit(&slp->ns_alock); |
| 534 | } |
| 535 | |
| 536 | bool |
| 537 | nfsdsock_testbits(struct nfssvc_sock *slp, int bits) |
| 538 | { |
| 539 | |
| 540 | return (slp->ns_aflags & bits); |
| 541 | } |
| 542 | |